Clinical trial NCT04700423
Conditions: Trichuriasis Ascariasis Hookworm Infections Helminthes; Infestation, Intestinal
Keywords: T. trichiura A. lumbricoides Hookworm Soil-transmitted Helminths Albendazole Ivermectin Moxidectin Intestinal parasites Anthelmintics
Sponsor: Jennifer Keiser
Start date: 2021-03-01; Completion date: 2021-09-22
Enrollment: 536 participants; Allocation: RANDOMIZED; Intervention model: PARALLEL

Brief summary:
The aim of this randomized controlled trial is to provide evidence on the efficacy and safety of co-administered moxidectin and albendazole compared to co-administered ivermectin and albendazole, and to assess the efficacy of the drug combinations compared to monotherapies in adolescents aged 12-19 years against infection with T. trichiura.

The efficacy of the different treatments will be determined 14-21 days, 5-6 weeks and 3 months post-treatment. Two fecal samples will be collected at each time-point assessment. The geometric mean based egg reduction rate (ERR) of T. trichiura egg counts will be assessed by Kato-Katz microscopy pre-treatment and 14-21 days post-treatment.

This trial will be conducted as a school-based study on Pemba Island (Zanzibar, Tanzania).

Detailed description:
We designed a non-inferiority trial to show that co-administered moxidectin and albendazole is non-inferior compared to co-administered ivermectin and albendazole in adolescents aged 12-19 years on Pemba Island (Tanzania). From previous studies conducted by our group, we expect similar efficacies from the combination moxidectin/ albendazole compared to ivermectin/ albendazole. However, moxidectin might be advantageous in terms of the drug's longer half-life and in areas with possible emerging ivermectin resistance. This study will allow comparing the efficacy of the two available co-administrations and will provide further insights on the potential value of moxidectin/ albendazole. Our data will pave the way for possible large scale, multi country follow-up studies. As recommended for new combination therapies, we simultaneously assess superiority of the drug combinations compared to monotherapies.

The primary objective is to demonstrate that co-administered moxidectin (8 mg) / albendazole (400 mg) is non-inferior to ivermectin (200 µg/kg) / albendazole (400 mg) in terms of egg reduction rates (ERRs) against T. trichiura infections assessed by Kato-Katz at 14-21 days post-treatment in adolescents aged 12-19 years using a non-inferiority margin of 2 percentage-points.

The secondary objectives of the trial are:

1. Efficacy assessments of combination therapies require demonstration of superiority against the respective monotherapies. Therefore, the trial has five different treatment groups: moxidectin (8 mg) / albendazole (400 mg) combination, ivermectin (200 µg/kg) / albendazole (400 mg) combination, albendazole (400 mg) monotherapy, ivermectin (200 µg/kg) monotherapy and moxidectin (8 mg) monotherapy.
2. to determine the CRs of the drug regimens against T. trichiura
3. to evaluate the safety and tolerability of the treatment
4. to determine the CRs and ERRs of the treatment schemes in study participants infected with hookworm and A. lumbricoides
5. to investigate potential extended effects on follow-up helminth prevalences (5-6 weeks and 3 months post-treatment) of the treatment regimens
6. to assess diagnostic performance and compare CRs based on egg counts retrieved from novel diagnostic tools (FECPAK-G2 and/or PCR) compared to standard microscopy
7. to characterize population PK parameters, as well as drug-drug interactions of active study treatments following single and co-administration in T. trichiura infected adolescents. If a dose-response is observed, a PK/PD analysis will further be performed

The study will be carried out in adolescents aged 12-19 years attending secondary schools on Pemba Island, Tanzania. After consenting, all participants will be asked to provide two stool samples (within a maximum of 7 days) at each time-point assesment. From each stool specimen, duplicate Kato-Katz thick smears (41.7 mg each) will be prepared and read under a microscope for eggs of T. trichiura, A. lumbricoides and hookworm by experienced technicians.

After randomization, all eligible adolescents will be treated with the respective single or combination treatment regimen according to their assigned treatment arm at day 0.

All drugs will be administered in the presence of the PI and/ co-PI, and ingestion confirmed. This will be recorded with the time and date of dosing. Participants will be kept for 3 hours after treatment administration to observe any possible acute AEs and reassessment will be done at 24h post-treatment. Additionally, interviews will be conducted to determine the emergence of clinical symptoms such as headache, abdominal pain, itching, nausea, vomiting and diarrhea directly before treatment within the scope of baseline assessment. At 3 and 24 hours after treatment and retrospectively at days 14 - 21 as well as 5-6 weeks and 3 months post-treatment, participants will again be interviewed for the assessment of adverse events (AEs).

Egg reduction rate calculated from the geometric means of co-administered moxidectin/ albendazole and ivermectin/ albendazole against T. trichiura assessed at 14-21 days post-treatment is the primary endpoint in our study.

Arms: arm 1: Combination therapy of moxidectin (8 mg using 2 mg tablets) plus albendazole (Zentel®, 400 mg, single tablet) administered orally at day 0 arm 2: Combination therapy of ivermectin (Stromectol®, 200 µg/kg using 3 mg tablets) plus albendazole (Zentel®, 400 mg, single tablet) administered orally at day 0 arm 3: Monotherapy of albendazole (400 mg) administered orally at day 0 Other names: Zentel® arm 4: Monotherapy of ivermectin ( 200 µg/kg using 3 mg tablets) administered orally at day 0 Other names: Stromectol® arm 5: Monotherapy of moxidectin (8 mg using 2 mg tablets) administered orally at day 0
Interventions: intervention 1: moxidectin (8 mg) / albendazole (400 mg) intervention 2: ivermectin (200 µg/kg) / albendazole (400 mg) intervention 3: ALBENDAZOLE 400 Mg ORAL TABLET [ZENTEL] intervention 4: ivermectin (200 µg/kg) intervention 5: moxidectin (8 mg)
Intervention descriptions: intervention 1: Combination therapy of moxidectin (8 mg using 2 mg tablets) plus albendazole (Zentel®, 400 mg, single tablet) administered orally at day 0 intervention 2: Combination therapy of ivermectin ((200 µg/kg), 3 mg tablet) plus albendazole (Zentel®, 400 mg, single tablet) administered orally at day 0 intervention 3: Monotherapy of albendazole (Zentel®, 400 mg, single tablet) administered orally at day 0 intervention 4: Monotherapy of ivermectin ((200 µg/kg), 3 mg tablet) administered orally at day 0 intervention 5: Monotherapy of moxidectin (8 mg, using 2 mg tablets) administered orally at day 0

Protocol documents:
Prot_SAP_000.pdf: 
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Efficacy and safety of moxidectin and albendazole compared to ivermectin 
and albendazole co-administration in adolescents infected with Trichuris 
trichiura: a randomized controlled trial 
Protocol Number 
1 
Version Number 
1.1 
Document Date 
07 October 2020 
Sponsor Contact 
Prof. Dr. Jennifer Keiser,  
Swiss Tropical and Public Health Institute,  
Tel.: +41 61 284-8218 
Fax: +41 61 284-8105 
E-mail: jennifer.keiser@unibas.ch 
Principle Investigator 
Prof. Dr. Jennifer Keiser,  
Swiss Tropical and Public Health Institute,  
Tel.: +41 61 284-8218 
Fax: +41 61 284-8105 
E-mail: jennifer.keiser@unibas.ch 
Funding Agency 
Bill and Melinda Gates Foundation 


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1. General information 
I. 
List of investigators and other persons involved 
 
Title 
Names 
Institution 
Position 
Function in trial 
Prof. Dr. 
Jennifer Keiser 
Swiss Tropical and 
Public Health Institute 
(Swiss TPH), Basel, 
Switzerland 
Unit head 
Principal 
Investigator 
Dr. 
Daniela Hofmann 
Swiss TPH 
Postdoc 
Co-PI 
MSc 
Sophie Welsche 
Swiss TPH 
Doctoral 
student 
Co-PI 
MSc 
Emmanuel Mrimi 
Swiss TPH 
Doctoral 
student 
Co-PI 
MSc 
Said Mohammed 
Ali 
Public Health 
Laboratory - Ivo de 
Carneri (PHL-IdC), 
Chake-Chake, Pemba 
(Tanzania) 
CEO 
Co-PI 
BSc 
Ghanil Mohamed 
Khatib 
Public Health 
Laboratory – Ivo de 
Carneri (PHL-IdC) 
Chake-Chake, Pemba 
(Tanzania) 
Laboratory 
Technician 
Co-PI 
Dr. 
Jan Hattendorf 
 
Swiss TPH  
 
Group leader 
Statistician 
 


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II. 
Signatures  
 
Statistician 
Signature 
 
 
 
 
 
Date of Signature  
17.02.2020 
Name  
Jan Hattendorf 
Title 
Dr.  
Institution 
Swiss Tropical and Public Health Institute 
Address 
Department of Medical Parasitology and Infection Biology 
Swiss Tropical and Public Health Institute, Socinstr. 57 
CH- 4002 Basel, Switzerland  
Phone 
+41 61 284-8193 
 
Principal investigator 
Signature 
 
 
 
 
 
Date of Signature  
17.02.2020 
Name  
Jennifer Keiser 
Title 
Prof. 
Institution 
Swiss Tropical and Public Health Institute 
Address 
Department of Medical Parasitology and Infection Biology 
Swiss Tropical and Public Health Institute, Socinstr. 57 
CH- 4002 Basel, Switzerland  
Phone 
+41 61 284-8218 
 
I have read this protocol and agree that it contains all necessary details for carrying out this trial. I will 
conduct the trial as outlined herein and will complete the trial within the time designated. 
I will provide copies of the protocol and all pertinent information to all individuals responsible to me 
who assist in the conduct of this trial. I will discuss this material with them to ensure they are fully 
informed regarding the drug and the conduct of the trial. 
I will use only the informed consent forms approved by the Sponsor or its representative and will fulfill 
all responsibilities for submitting pertinent information to the Independent Ethics Committees 
responsible for this trial. 
I agree that the Sponsor or its representatives shall have access to any source documents from which 
Case Report Form information may have been generated. 


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Co-Principal investigator 
Signature 
 
 
 
Date of Signature  
17.02.2020 
Name  
Daniela Hofmann 
Title 
Dr. 
Institution 
Swiss Tropical and Public Health Institute 
Address 
Department of Medical Parasitology and Infection Biology 
Swiss Tropical and Public Health Institute, Socinstr. 57 
CH- 4002 Basel, Switzerland  
Phone 
+41 61 284 83 14 
 
 
 
Co-Principal investigator 
Signature 
 
 
 
 
Date of Signature  
17.02.2020 
Name  
Sophie Welsche 
Title 
MSc 
Institution 
Swiss Tropical and Public Health Institute 
Address 
Department of Medical Parasitology and Infection Biology 
Swiss Tropical and Public Health Institute, Socinstr. 57 
CH- 4002 Basel, Switzerland  
Phone 
+41 61 284 82 86 
 
 
 
Co-Principal investigator 
Signature 
 
 
 
Date of Signature  
17.02.2020 
Name  
Emmanuel Mrimi 
Title 
MSc 
Institution 
Swiss Tropical and Public Health Institute 
Address 
Department of Medical Parasitology and Infection Biology 
Swiss Tropical and Public Health Institute, Socinstr. 57 
CH- 4002 Basel, Switzerland  
Phone 
+41 61 284 82 86 
 
 
 
 


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Co-Principal investigator 
Signature 
 
 
 
 
Date of Signature  
17.02.2020 
Name  
Said Ali 
Title 
MSc  
Institution 
Public Health Laboratory Ivo de Carneri 
Address 
Public Health Laboratory Ivo de Carneri 
P.O. Box 122 Wawi, Chake Chake 
Pemba, Zanzibar (Tanzania) 
Phone 
+255 24 245-2003 
 
 
Co-Principal investigator 
 
Signature 
 
 
 
Date of Signature  
11.05.2020 
Name  
Ghanil Mohamed Khatib 
Title 
BSc 
Institution 
Public Health Laboratory Ivo de Carneri 
Address 
Public Health Laboratory Ivo de Carneri 
P.O. Box 122 Wawi, Chake Chake 
Pemba, Zanzibar (Tanzania) 
Phone 
+255 24 245-2003 


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Table of contents 
 
1. 
General information ........................................................................................................................ 2 
2. 
Background information ................................................................................................................ 15 
3. 
Trial objective and purpose ........................................................................................................... 17 
4. 
Methodology ................................................................................................................................. 18 
4.1 
Primary and secondary endpoint ........................................................................................... 18 
4.2 
Type of trial ........................................................................................................................... 18 
4.3 
Trial design ............................................................................................................................ 18 
4.3.1 
Baseline survey and screening ....................................................................................... 18 
4.3.2 
Diagnosis ....................................................................................................................... 19 
4.3.3 
Clinical examination ...................................................................................................... 20 
4.3.4 
Adverse events assessment ............................................................................................ 20 
4.3.5 
Assessment of efficacy after treatment .......................................................................... 20 
4.3.6 
Pharmacokinetic studies ................................................................................................ 21 
4.4 
Measure to minimize bias ...................................................................................................... 22 
4.5 
Study duration and duration of subject participation ............................................................. 22 
4.6 
Schedule of visits ................................................................................................................... 23 
5. 
Selection of the trial subjects ......................................................................................................... 23 
5.1 
Recruitment ........................................................................................................................... 23 
5.2 
Inclusion criteria .................................................................................................................... 24 
5.3 
Exclusion criteria ................................................................................................................... 24 
5.4 
Criteria for discontinuation of trial ........................................................................................ 24 
5.5 
Treatment of subjects ............................................................................................................ 25 
5.6 
Concomitant therapy ............................................................................................................. 26 
6. 
Safety assessments ........................................................................................................................ 26 
6.1 
Adverse event definitions ...................................................................................................... 26 
6.1.1 
Severity grading............................................................................................................. 27 
6.1.2 
Relatedness .................................................................................................................... 27 
6.1.3 
Expectedness ................................................................................................................. 28 
6.1.4 
Serious adverse events ................................................................................................... 28 


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6.1.5 
Suspected unexpected serious adverse reactions ........................................................... 28 
6.2 
Methods of recording and assessing adverse events ............................................................. 29 
6.3 
Reporting of serious adverse events ...................................................................................... 29 
6.4 
Safety reporting to Health Authorities and Ethics Committees ............................................ 30 
7. 
Data management and data quality control ................................................................................... 31 
7.1 
Source data ............................................................................................................................ 31 
7.2 
Data collection and documentation ....................................................................................... 32 
7.3 
Ethical, legal and security issues ........................................................................................... 33 
7.4 
Data storage and preservation ............................................................................................... 33 
7.5 
Study documents: translations – reference language ............................................................. 33 
8. 
Statistics......................................................................................................................................... 33 
8.1 
Definition of primary endpoint .............................................................................................. 33 
8.2 
Justification of number of trial subjects ................................................................................ 34 
8.3 
Description of statistical methods ......................................................................................... 34 
9. 
Duties of the investigator............................................................................................................... 36 
9.1 
Investigator’s confirmation ................................................................................................... 36 
9.2 
Damage coverage .................................................................................................................. 36 
9.3 
Project management .............................................................................................................. 36 
10. 
Ethical considerations ................................................................................................................ 37 
10.1 
Independent Ethics Committee (IEC) ................................................................................... 37 
10.2 
Evaluation of the risk-benefit ratio ........................................................................................ 37 
10.3 
Subject information and consent ........................................................................................... 37 
10.4 
Subjects requiring particular protection ................................................................................ 38 
11. 
Quality control and quality assurance ....................................................................................... 38 
11.1 
Monitoring and auditing ........................................................................................................ 38 
11.2 
Data and safety monitoring board (WHO) / data monitoring committee (EU/FDA) ............ 38 
12. 
Dissemination of results and publication .................................................................................. 38 
13. 
References ................................................................................................................................. 39 


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III. 
Abbreviations 
AE 
Adverse event 
BMGF 
Bill & Melinda Gates Foundation 
CI 
Confidence interval 
CR 
Cure rate 
CRF 
Case report form 
EKNZ 
Ethikkomission Nordwest- und Zentralschweiz 
EML 
Essential medicine list 
EPG 
Eggs per gram 
ERR 
Egg reduction rate 
FDA 
Food and Drug Administration 
GCP 
Good clinical practice 
Hb 
Hemoglobin 
ICF 
Informed  consent form 
ICH 
International 
council 
for 
harmonization 
of 
technical 
requirements 
for 
pharmaceuticals for human use 
IEC 
Independent ethics committee 
LC-MS/MS 
Liquid chromatography tandem mass spectrometry 
MDA 
Mass drug administration 
NLME 
Nonlinear mixed-effects 
PCR 
Polymerase chain reaction 
PI 
Principal investigator 
PD 
Pharmacodynamics 
PK 
Pharmacokinetics 
SAE 
Serious adverse event 
STH 
Soil-transmitted helminth 
WHO 
World Health Organization 
ZAHREC 
Zanzibar Health Research Ethics Review Committee 


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IV. 
Synopsis 
 
Sponsor/Sponsor-
Investigator 
Prof. Dr. Jennifer Keiser 
Study Title 
Efficacy and safety of moxidectin and albendazole compared to 
ivermectin and albendazole co-administration in adolescents infected 
with Trichuris trichiura: a randomized controlled trial 
Short title 
Efficacy and safety of MOX/ALB vs. IVM/ALB co-administration 
Protocol Number, Date 
and Version 
1, 07.10.2020, v1.1 
Trial registration 
Will be registered on https://www.clinicaltrials.gov/  
Clinical phase 
Phase 2 trial 
Sample size 
540 
Indication 
Trichuris trichiura infection (eggs in stool) 
Investigational Product 
and Reference Treatment 
Moxidectin/ albendazole combination 
Reference: ivermectin/ albendazole combination 
Study Rationale 
To provide evidence on the efficacy and safety of co-administered 
moxidectin and albendazole compared to co-administered ivermectin 
and albendazole, and to assess the efficacy of the drug combinations 
compared to monotherapies in adolescents aged 12-19 years against 
infection with T. trichiura. 
 
 


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Study Objectives 
Our primary objective is to demonstrate non-inferiority of 
 
Arm A: moxidectin (8 mg) / albendazole (400 mg) combination, 
compared to  
 
Arm B: ivermectin (200 µg/kg) / albendazole (400 mg) 
 in terms of egg reduction rates (ERRs) against T. trichiura infections in 
adolescents aged 12-19 years assessed at 14-21 days post-treatment by 
Kato-Katz microscopy. 
The secondary objectives of the trial are: 
 
a.) to assess superiority in terms of CRs of the drug combinations 
compared to their corresponding monotherapies: Arm C: 
Albendazole (400 mg) Arm D: Ivermectin (200 µg/kg) and Arm 
E: Moxidectin (8 mg)  
b) to determine the cure rates (CRs) of combination therapies 
against T. trichiura 
c) to evaluate the safety and tolerability of the treatment 
d) to determine the CRs and ERRs of the treatment schemes study 
participants co-infected with hookworm and A. lumbricoides 
e) to investigate potential extended effects on follow-up helminth 
prevalence (5-6 weeks and 3 months post-treatment) of the 
treatment regimens  
f) to assess diagnostic performance and compare CRs based on egg 
counts retrieved from novel diagnostic tools (FECPAK-G2 
and/or PCR) compared to standard Kato-Katz microscopy 
g) to characterize pharmacokinetics (PK) or drug-drug interactions 
of study drugs following monotherapy or co-administration in 
T. trichiura infected adolescents. If a dose-response is observed, 
a Pharmacokinetic/-dynamic (PK/PD) analysis of the study 
drugs will be performed. 
Study design 
Randomized controlled trial, open-label with masked outcome assessor 
Study product / 
intervention 
Administration of a single oral dose of moxidectin (8mg) / albendazole 
(400mg)  
 
 


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Comparator(s) 
Primary: ivermectin (200 µg/kg) / albendazole (400mg) 
Secondary: albendazole (400 mg), moxidectin (8 mg) and ivermectin 
(200 µg/kg) monotherapy 
Key inclusion / Exclusion 
criteria 
Inclusion: Adolescents aged 12-19 years infected with T. trichiura with 
a minimum count of 48 eggs per gram (EPG) of stool and at least two 
out of four Kato-Katz slides positive 
 having given written informed consent signed by either the 
participant him/herself (if majority reached; ≥18 years) or by 
caregivers for minors; and written assent by minors (12-17 years) 
 able and willing to be examined by a study physician before 
treatment 
 able and willing to provide two stool samples at baseline and on the 
three follow-up assessments (14-21 days, 5-6 weeks and 3 months 
post-treatment),  
Exclusion: 
 No written informed consent by individual or caregiver and/or no 
written assent by minors  
 Any trial or safety relevant abnormal medical conditions (including 
severe anemia, body temperature ≥ 38°C and or history of acute or 
severe chronic disease 
 recent use of anthelminthic drugs (past 4 weeks) 
 attending other clinical trials during study 
 known allergy to study medication 
 pregnancy, lactating or planning to become pregnant within the 
study period. 
 
Primary Endpoints 
ERR against T. trichiura at 14-21 days after treatment derived from EPG 
assessed by Kato-Katz 


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Secondary Endpoints 
 CRs against T. trichiura assessed at 14-21 days post-treatment 
 CRs and ERRs against A. lumbricoides and hookworm assessed at 
14-21 days post-treatment 
 Adverse events 
 Infection status and intensity assessed at baseline and 14-21 days 
post-treatment by novel diagnostic tools (FECPAK-G2 and/or 
PCR) 
 Infection status and intensity assessed by Kato-Katz at 5-6 weeks 
and 3 months after treatment 
 Characterization of population PK parameters and evaluation of 
possible 
drug-drug 
interactions 
between 
moxidectin 
and 
albendazole as well as ivermectin and albendazole and possibly 
PK/PD parameters of all drugs and combinations in T. trichiura 
infected adolescents 
Exploratory Endpoints 
None  
Interim Analyses 
None 
Study Duration 
6 months total; up to 6 months per participant 
Schedule 
05/2021 of first-participant in (planned) 
11/2021 of last-participant out (planned) 
Study centres 
Pemba Island (Tanzania) 
Measurements & 
procedures 
Two stool samples will be collected if possible on two consecutive days 
or otherwise within a maximum of 7 days. The medical history of the 
participants will be assessed with a standardized questionnaire, in 
addition to a clinical examination carried out by the study physician 
before treatment.  
All participants will be interviewed before treatment and after 3 and 24 
hours (active surveillance) and retrospectively again at 14 - 21 days as 
well as 5-6 weeks and 3 months after treatment about the occurrence of 
adverse events (AEs). Any potential AEs happening between 24 hours 
and the respective follow-up time points will be monitored passively and 
medical intervention as determined suitable by a study physician 
provided if necessary. 


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The efficacy of the treatment and potential extended effects on follow-
up prevalence will be determined around 14 - 21 days, 5-6 weeks and 3 
months post-treatment by collecting another two stool samples. 
All stool samples will be examined with duplicate Kato-Katz thick 
smears for T. trichiura, A. lumbricoides, and hookworm. From the 
remaining stool specimen, 3g will be analyzed with the FECPAK-G2 
platform and 1.5-2g will be preserved in 70% ethanol and shipped to 
Swiss TPH, Basel or another reference laboratory for subsequent PCR-
analysis. 
Each participant will be asked to provide a finger-prick blood sample for 
hemoglobin measurement at baseline. At the same time, anthropometric 
measurements (i.e. height, and weight) will be taken for all participants. 
To determine PK/PD parameters of the study drugs, a subsample of 60 
willing study participants of all treatment arms will be asked to provide 
a maximum of 4 micro blood samples using finger pricks at defined time 
points between day 0 and day 7.  
Statistical Analyses 
An available case analysis according to the intention to treat principles 
will be performed, including all subjects with primary endpoint data. 
Additionally, a per-protocol analysis will be conducted. Geometric and 
arithmetic mean egg counts will be calculated for the different treatment 
arms before and after treatment to assess the corresponding ERRs. 
Bootstrap resampling method with 5,000 replicates will be used to 
calculate 95% confidence intervals (CIs) for ERRs and differences 
between ERRs.  
CRs will be calculated as the percentage of egg-positive subjects at 
baseline who become egg-negative after treatment, assessed at 14-21 
days with quadruple Kato Katz assays. Differences among CRs 
(between treatment arms and between diagnostic approaches) will be 
analyzed by using crude and adjusted logistic regression modelling 
(adjustment for infection intensity, age, sex and weight). Adverse events 
will be compiled into frequency tables and compared between treatment 
groups using descriptive summaries.  
To determine PK/PD parameters, nonlinear mixed-effects (NLME) 
modeling will be used. To assess differences in diagnostic performance 
of the different tools used as compared to the standard Kato-Katz 


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microscopy (FECPAK-G2 and/or PCR) a readily available hierarchical 
Bayesian egg-count model will be applied to the individual level data. 
GCP statement 
This study will be conducted in compliance with the protocol, the current 
version of the Declaration of Helsinki, ICH-GCP E6 (R2) as well as all 
national legal and regulatory requirements. 
Key explanation for the 
inclusion of children 
This study will involve adolescents of at least 12 years of age, since an 
infection with T. trichiura occurs most often in children who are 
therefore the main target group of deworming campaigns. Younger 
children will not be included as moxidectin is registered only for 
children ≥ 12 years. 
Recruitment procedure 
The trial will be conducted in Pemba (Zanzibar, Tanzania).  
It will take place in areas with moderate to high T. trichiura endemicity 
(communities/schools with a prevalence ≥ 25%) identified from earlier 
studies and/or based on experience of the local collaborating team. It 
will be implemented as a school-based study.  
Coverage of damages 
Winterthur Police Nr. 4746321, National Insurance Corporation of 
Tanzania (to be issued) 
Storage of data and 
samples for future 
research aims 
After the study has been completed, all samples will be destroyed. Case 
report forms and electronic source data will be kept for a minimum of 
15 years. 
 
Conflict of interest in 
relation to the investigated 
drugs 
We declare no conflict of interest in relation to the investigated drugs. 


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2. Background information 
Albendazole and mebendazole are the most widely used drugs for preventive chemotherapy campaigns 
against soil-transmitted helminth (STH) infections. Albendazole is characterized by high cure rates 
(CRs) against infections with Ascaris lumbricoides (96%) and hookworm infections (80%). Mass drug 
administration (MDA) with single dose albendazole has already been considered insufficient to achieve 
World Health Organization (WHO) goals of morbidity reduction, in the case of Trichuris trichiura 
infections due to the low efficacy of this drug (CR 31%) [1, 2].  
Therapies combining two or more drugs are widely advocated in different therapeutic areas such as 
tuberculosis, malaria, HIV/AIDS or cancer. The underlying rationale for multifactorial pharmacological 
treatment varies with the disease and includes the protection against the selection of drug-resistance, 
and hence, a prolongation of the life-span of effective and available drugs, and to increase and broaden 
the efficacy over drugs being administered in monotherapy [3].   
To help prioritize candidate STH combinations, the Bill & Melinda Gates Foundation (BMGF) defined 
different levels of investment risk. In more detail, the prioritization includes four tiers and takes into 
account (i) the current efficacy and safety data of existing anthelmintic drugs; (ii) the financial and time 
investment required to generate the necessary evidence to change WHO treatment guidelines; and (iii) 
the potential for transformational change. The ivermectin/ albendazole combination was identified as a 
first-tier priority. Moxidectin/ albendazole was classified as second tier priority (since at this stage the 
drug was not yet approved). 
In 2017, ivermectin in combination with albendazole for treatment of STH was added on the Essential 
Medicines List (EML) paving the way to further evaluate efficacy of this combination among school-
aged children and communities in a range of epidemiological settings [4]. While for ivermectin/ 
albendazole evidence of superiority compared to single standard treatments in different settings and over 
varying time points is growing [5, 6], we still have very few studies providing similar results for the co-
administration of moxidectin and albendazole in STH infections [7]. 
Moxidectin was recently approved by the Food and Drug Administration (FDA) for the treatment of 
onchocerciasis at a dose of 8 mg. Our own studies have shown that the combination of moxidectin/ 
albendazole might reveal high potential in the treatment of STH infections [7, 8]. Moreover, our recent 
dose-finding study against T. trichiura infections revealed that the approved 8 mg dose (regardless 
whether combined with albendazole or monotherapy) performs as good as higher doses against this STH 
[9].  However, there is a need to explore whether the longer half-life of moxidectin (compared to 
ivermectin) could reveal a benefit in the treatment of STH infections [10]. Finally, there is a need to 
thoroughly evaluate the efficacy of the marketed tablet moxidectin formulation (our previous studies 
used a different formulation). 
 
 


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In this trial, we test for non-inferiority of both currently approved and available drug combinations (i.e. 
moxidectin/ albendazole against ivermectin/ albendazole) and for superiority of the combination therapy 
compared to the respective monotherapies. Furthermore, potential extended effects through a prolonged 
efficacy assessment scheme in adolescents in Pemba (Tanzania) are examined. Follow-up will be 
conducted at approx. 14-21 days, 5-6 weeks and 3 months post-treatment to assess co-benefits on worm 
burden reduction from the relatively long half-life of moxidectin (T1/2: 491-832 hours) [11, 12] compared 
to ivermectin (T1/2:16-32 hours; increasing with age) [13]. Given the comparatively long half-live of 
moxidectin, the standard follow-up period of 14-21 days recommended by WHO might not be sufficient 
to reveal the full potential of the drug. Therefore, two more follow-up time points will give the 
opportunity to investigate potential extended effects on infection status and intensity. Results from this 
trial will inform decisions on how anthelminthic combination therapy could be introduced into existing 
MDA programs and, therefore, provide a valuable adjunct tool for interrupting STH transmission. 
The pharmacokinetic/-dynamic (PK/PD) characterization of a drug is essential to understand the 
response of the human body to a drug and vice versa, especially in populations that physiologically 
differ from healthy adults. Physiological characteristic like mal- or undernutrition or intestinal worms, 
such as T. trichiura, can potentially affect the PK of a drug.[14, 15]. For moxidectin, clinical 
pharmacokinetics have so far exclusively been assessed in a limited number of healthy adults [16, 17].  
A trial currently being conducted by our group will characterize PK and evaluate PK/PD parameters of 
moxidectin in adults infected with Strongyloides stercoralis. Our study will be the first one to provide 
information on the PK, PK/PD on all three drugs in this population and thus guide optimal drug dosing 
in T. trichuris-infected adolescence in Pemba. Additionally, we aim to provide novel information on the 
possible interplay of moxidectin and ivermectin with albendazole when co-administered. For this it is 
necessary to take not only samples in the combination arm but also in the monotherapy arms.   
Micro blood sampling by collecting blood from a finger prick has become the preferred method not only 
for molecular epidemiological studies but also for PK studies due to its minimal invasiveness, and simple 
and fast handling [18]. Furthermore, the results gained by this method have been repeatedly shown to 
correlate well with the standard venous blood sampling, which also holds true for ivermectin and 
albendazole and is currently under investigation for moxidectin by our group [19, 20]. A sparse sampling 
approach will be used in 60 participants, which allows to use only 4 samples per individual.   
 
 
 


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3. Trial objective and purpose 
We designed a non-inferiority trial to show that co-administered moxidectin and albendazole is non-
inferior compared to co-administered ivermectin and albendazole in adolescents aged 12-19 years on 
Pemba Island (Tanzania). From previous studies conducted by our group, we expect similar efficacies 
from the combination moxidectin/ albendazole compared to ivermectin/ albendazole [7, 8]. However, 
moxidectin might be advantageous in terms of the drug’s longer half-life and in areas with possible 
emerging ivermectin resistancy [17, 21]. This study will allow comparing the efficacy of the two 
available co-administrations and will provide further insights on the potential value of moxidectin/ 
albendazole. Our data will pave the way for possible large scale, multi country follow-up studies. As 
recommended for new combination therapies, we simultaneously assess superiority of the drug 
combinations compared to monotherapies.  
The primary objective is to demonstrate that co-administered moxidectin (8 mg) / albendazole (400 
mg) is non-inferior to ivermectin (200 µg/kg) / albendazole (400 mg) in terms of egg reduction rates 
(ERRs) against T. trichiura infections assessed by Kato-Katz at 14-21 days post-treatment in adolescents 
aged 12-19 years using a non-inferiority margin of 2 percentage-points. 
The secondary objectives of the trial are: 
a) Efficacy assessments of combination therapies require demonstration of superiority against the 
respective monotherapies. Therefore, the trial has five different treatment groups: moxidectin 
(8 mg) / albendazole (400 mg) combination, ivermectin (200 µg/kg) / albendazole (400 mg) 
combination,  albendazole (400 mg) monotherapy, ivermectin (200 µg/kg) monotherapy and 
moxidectin (8 mg) monotherapy. 
b) to determine the CRs of the drug regimens against T. trichiura 
c) to evaluate the safety and tolerability of the treatment 
d) to determine the CRs and ERRs of the treatment schemes in study participants infected with 
hookworm and A. lumbricoides 
e) to investigate potential extended effects on follow-up helminth prevalences (5-6 weeks and 3 
months post-treatment) of the treatment regimens 
f) to assess diagnostic performance and compare CRs based on egg counts retrieved from novel 
diagnostic tools (FECPAK-G2 and/or PCR) compared to standard microscopy 
g) to characterize population PK parameters, as well as drug-drug interactions of active study 
treatments following single and co-administration in T. trichiura infected adolescents. If a dose-
response is observed, a PK/PD analysis will further be performed 
 
 


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4. Methodology 
4.1 
Primary and secondary endpoint 
Primary endpoint: the geometric mean based ERR of T. trichiura egg counts assessed by Kato-Katz 
microscopy pre-treatment and 14-21 days post-treatment. 
Secondary endpoint: CR of T. trichiura as well as CRs and ERRs for A. lumbricoides and hookworm 
assessed by Kato-Katz at 14-21 days post-treatment. In addition, tolerability of treatment (AEs), 
infection status and intensity assessed at baseline and 14-21 days post-treatment by novel diagnostic 
tools (FECPAK-G2 and/or PCR), infection status and intensity derived by Kato-Katz at 5-6 weeks and 
3 months post-treatment and PK/PD parameters of the study drugs will be assessed.  
4.2 
Type of trial 
Randomized controlled trial, open-label with masked outcome assessor. 
4.3 
Trial design 
4.3.1 
Baseline survey and screening 
A randomized-controlled trial will be conducted with five treatment arms to be followed-up over a 3-
month period. This trial will be conducted as a school-based study on Pemba Island (Zanzibar, 
Tanzania). Several secondary schools in areas with suspected high T. trichiura endemicity as identified 
from previous research and experience of our local collaborators will be visited. In each selected school, 
adolescents aged 12-19 years will be invited for study participation. The Zanzibar education system has 
adopted a 12-year compulsory basic education cycle with abolished school fees and parents’ 
contributions since 2015 leading to high general enrolment rates for secondary schools (85% of eligible 
children finalize the last primary grade level) but also comparably high ordinary secondary level survival 
of more than half of all pupils (54%) [22]. Entering school over-age is a common occurrence in Zanzibar, 
thus ages of secondary level pupils may well range from 12 to 19 years of age. We are thus confident 
that recruitment of adolescents aged 12-19 years through a school-based approach is not only more 
efficient than working in communities but also still representative for the total population of this age 
strata. Adolescents are within the main target group of helminth control programs and are listed among 
potential receivers of moxidectin that is, so far, only approved from 12 years of age onwards [23]. 
The study includes one baseline and three follow-up assessments at 14 – 21 days, 5-6 weeks and 3 
months.  The study is designed as a five-arm trial including two arms with combined treatment through 
co-administration of separate tablets (arm A; moxidectin/ albendazole, arm B; ivermectin/ albendazole) 
and three arms with single drug administration (arm C; albendazole, arm D; ivermectin, arm E; 
moxidectin). 


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4.3.2 
Diagnosis 
At baseline, all participants will be asked to provide two stool samples (within a maximum of 7 days). 
From each stool specimen, duplicate Kato-Katz thick smears (41.7 mg each) [24] will be prepared and 
read under a microscope for eggs of T. trichiura, A. lumbricoides and hookworm by experienced 
technicians. To ensure quality of hookworm diagnosis, 10% of the samples will be divided into two sub-
samples; one of the containers will keep its original participant ID, whereas the second container will 
be labeled with a new ID (assigned by the co-PI). Duplicate Kato-Katz will be prepared from both 
containers and the findings compared. For hookworm, results are considered correct if no difference in 
presence/absence is found. For quality control of A. lumbricoides and T. trichiura egg counts, 10% of 
slides will be re-read by another laboratory technician. Results are considered correct if the following 
tolerance margin is not exceeded: (i) No difference in presence/absence of A. lumbricoides and 
T. trichiura (ii) egg counts are +/-10 eggs for counts ≤100 eggs or +/-20% for counts >100 eggs (for 
each species separately). In case discrepancies above the tolerance margin are noted in one or more 
slides, the respective slides are re-read by the local technicians. The new results are discussed, so that 
in case of discordant results, slides can be re-evaluated to reach consensus. The same slides might further 
be re-read by an automatized reading system (Kato-Katz 2.0) if available at study start. 
Figure 1: Design and timeline of the randomized-controlled trial to be implemented on Pemba Island (Tanzania). 


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All microscopically analyzed quadruplicate Kato-Katz thick smears will be destroyed after passing the 
quality control. Additionally, a portion of 1.5-2 g of stool from each specimen will be preserved in 70% 
ethanol and shipped to a reference laboratory for polymerase chain reaction (PCR) analysis (to be 
determined) [25]. The same sampling procedure and diagnostic approach will be applied at days 14-21, 
5-6 weeks and 3 months post-treatment. At baseline and 14-21 days post-treatment, 3g of the remaining 
stool specimen will be used for analysis with a further developed version of the FECPAK-G2 device 
using a similar laboratory protocol as applied in previous studies [26, 27]. 
4.3.3 
Clinical examination 
A clinical examination of the study participants assessing general health, anthropometric parameters 
including height and weight as well as tympanic temperature using an ear thermometer will precede the 
treatment. Each participant will be asked to provide a finger-prick blood sample for hemoglobin (Hb) 
levels, which will be detected using a HemoCue analyzer (Hb 301 system, Angelholm, Sweden). To 
avoid accidental treatment of pregnant girls/women all female participants will be asked to provide a 
urine sample to be subjected to a pregnancy RDT at baseline and at the end of the study 3 months after 
treatment. Girls/women will be individually counselled that they should not become pregnant during the 
entire study period. All trial participants will further be asked about existing clinical symptoms before 
drug administration. 
4.3.4 
Adverse events assessment 
Participants will be kept for 3 hours after treatment administration to observe any possible acute AEs 
and reassessment will be done at 24h post-treatment. Additionally, interviews will be conducted to 
determine the emergence of clinical symptoms such as headache, abdominal pain, itching, nausea, 
vomiting and diarrhea directly before treatment within the scope of baseline assessment. At 3 and 24 
hours after treatment and retrospectively at days 14 – 21 as well as 5-6 weeks and 3 months post-
treatment, participants will again be interviewed for the assessment of adverse events (AEs). Symptoms 
arising within the timespan of 24 hours after treatment and the respective follow-up time points will be 
monitored passively by teachers or local health workers who will report incidences to the study team. 
Any symptoms are recorded in the CRF and immediate action will be undertaken according to the 
judgement of a study physician if indicated.  
 
4.3.5 
Assessment of efficacy after treatment 
The efficacy of the treatment will be determined 14-21 days post-treatment by collecting another two 
stool samples, which will be microscopically examined for T. trichiura using duplicate Kato-Katz thick 
smears. Participants will be considered cured if no T. trichiura eggs are found in the follow-up stool 
samples. Eggs per gram will be assessed by adding up the egg counts from the quadruplicate Kato-Katz 
thick smears and multiplying this number by a factor of six. Geometric and arithmetic mean egg counts 


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will be calculated for the different treatment arms before and after treatment to assess the corresponding 
ERRs. At the end of the study all participants remaining positive for any STH infection will be treated 
with the currently best recommended treatment, i. e. ivermectin/ albendazole against T. trichiura and 
hookworm and albendazole against A. lumbricoides.  
 
4.3.6 
Pharmacokinetic studies 
The exposure-response correlation study will be performed in a maximum of 15 participants in the 
combination chemotherapy treatment arms and 10 participants in the monotherapy treatment arms, 
amounting to a subsample of 60 participants overall. This number of participants was determined to be 
representative of the study community taking into account the relatively low variability among PK 
values within a population. The absorption of all study drugs is known to be better after consumption of 
a high-fat meal, therefore study participants will receive a local high-fat breakfast before treatment [16]. 
Since PK population parameters of all study drugs are available [31], a sparse sampling approach can 
be applied to describe the PK profiles of the individual drugs upon co-administration as well as a 
potential interference between moxidectin or ivermectin and albendazole. Within a sparse sampling 
approach, instead of describing the PK profile for each participant separately, samples are allocated to 
different time points and individuals within the same treatment. Statistical inferences are performed to 
characterize the population-based PK profile of a specific treatment arm. This approach allows for a 
reduced number of samplings per participant and renders a PK characterization well tolerable. To this 
end, a small drop of blood from the fingertip will be taken. The sampling will be performed according 
to the following scheme: 
 
A maximum of 4 finger pricks will be done per participant throughout the whole PK study 
 
Of these 4 finger pricks per participant, a maximum of 3 pricks will be done on the same day 
 
The intervals between the pricks done on the same day will be at least 1h 
 
The whole PK study will be completed between day 0 and day 7 
The sparse sampling scheme will allow for a sufficient number of data points at a subsample of 60 
participants to model the PK profiles of the drugs. The exact time points will have to be adapted 
according to PK data gathered during a current trial conducted by our group for the evaluation of the 
efficacy of moxidectin against Strongyloides stercoralis. Capillary blood (≤ 30µL, i.e. 10µL for 
ivermectin and albendazole and 30µL for moxidecin) will be collected by puncture with a finger prick. 
Two microsamples (duplicates) will be taken with one finger prick. Each time, the drop of blood (10 – 
30 µL) will be directly transferred on filter paper or Mitra® sticks which should dry for approximately 
one hour. The dried sticks and filter paper will be transported to Swiss TPH, Basel, and stored at -20°C 
until analysis. The quantification of the study drugs will be performed using the validated liquid 
chromatography tandem mass spectrometry (LC-MS/MS) method as described elsewhere [20, 31]. Drug 
concentrations will be calculated by interpolation from a calibration curve with a lower limit of 
quantification of 1-5ng/ml. 7% of the sample duplicates will be analyzed for quality control, and the 


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measured concentrations will be used to determine between-run and overall precision and accuracy of 
the analysis. 
4.4 
Measure to minimize bias 
Study participants eligible for treatment will be randomly assigned to one of the five treatment arms 
using a computer-generated stratified randomization code. The random allocation sequence will be 
generated by using an algorithm which minimizes deviations from the anticipated arm sizes stratified 
by 2 levels of baseline infection intensity (light: 1-999 EPG, and moderate plus heavy: ≥ 1000 EPG 
T. trichiura infections) which will be provided by the trial statistician not involved in enrolment, 
treatment and data collection. This way, all treatment arms will have a similar proportion of participants 
with light infection intensity. The number of light versus moderate/heavy infections however are not 
expected to be equal in each arm, depending on the distribution of infection intensity in the recruited 
cohort.  Allocation concealment will be warranted by masking the randomization sequence from the 
team member conducting the recruitment. Due to the complexity of the treatment scheme, blinding will 
not be feasible in order to avoid an unnecessary administration of a large amount of placebo pills. 
Masking of the outcome assessor is warranted since the laboratory technicians determining the egg 
counts for the efficacy assessment will have no knowledge of the participants’ assignment to treatment 
arms. 
4.5 
Study duration and duration of subject participation 
The trial will last 6 months, and screening for the baseline is scheduled to start 3 months prior to 
treatment. Follow-up screenings will take place between 14-21 days, 5-6 weeks and 3 months post-
treatment and will last approximately three weeks respectively. Thus, the maximum time for subject 
participation will be 6 months. Schedules of visits are summarized below.  
 
 


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4.6 
Schedule of visits 
Table 1. Schedule of visits of during study. 
 
Screening 
Baseline/Treatment/Safety 
 
Follow up 
 
Before day 0 
0h 
Randomization and treatment 
3h 
24h 
Until day 7 
14-21 days 
5-6 weeks 
3 months 
Informed consent 
X 
 
 
 
 
 
 
 
Diagnosis (stool examination) 
X 
 
 
 
 
X 
X 
X 
Medical history 
 
X 
 
 
 
 
 
 
Clinical examination 
 
X 
 
 
 
 
 
 
Pregnancy testing 
 
X 
 
 
 
 
 
X 
Hemoglobin measurement 
 
X 
 
 
 
 
 
 
PK (micrsosampling) 
 
X 
X 
X 
X 
 
 
 
Capturing AEs 
 
 
X  
X 
 
X 
X 
X 
Capturing SAE 
 
 
X  
X 
 
X 
X 
X 
 
5. Selection of the trial subjects 
5.1 
Recruitment 
The study will be carried out in adolescents aged 12-19 years attending secondary schools on Pemba 
Island, Tanzania. Schools in areas with moderate to high T. trichiura infection intensities will be selected 
and identified based on experience from earlier studies and/or knowledge of the local collaborating 
teams. The trial will be implemented as a school-based study in order to simplify recruitment of 
adolescents. Caregivers of potential participants and adolescents aged ≥18 years will be invited to 
participate in an information session. The research team will explain the purpose and procedures of the 
study, as well as potential benefits and risks of participation. Attendees will be encouraged to ask 
questions which will be discussed in an open setting.  
Caregivers interested in having their child/children of 12-17 years of age participate in the study or 
adolescents aged 18-19 years willing to participate will be invited to complete the process of informed 
consent by signing the informed consent form (ICF). In addition, written assent will be obtained from 
underage participants. Participants having a signed ICF will be assessed for eligibility during screening 
procedures.  
 
 
 


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5.2 
Inclusion criteria 
1. 
Aged between 12 and 19 years. 
2. 
Written informed consent signed by either parents/caregivers for underage adolescents (aged 12-
17 years) or by the participant him/herself (18-19 years of age); and written assent by underage 
participant. 
3. 
Agree to comply with study procedures, including provision of two stool samples at the beginning 
(baseline) and on three follow-up assessments (14-21 days, 5-6 weeks and 3 months after 
treatment). 
4. 
Willing to be examined by a study physician prior to treatment. 
5. 
At least two slides of the quadruple Kato-Katz thick smears positive for T. trichiura and infection 
intensities of at least 48 EPG. 
 
5.3 
Exclusion criteria 
1. 
No written informed consent by individual or caregiver and/or no written assent by minors  
2. 
Presence or signs of major systemic illnesses, e.g. body temperature ≥ 38°C, severe anemia (below 
80g/l Hb according to WHO [32]) upon initial clinical assessment. 
3. 
History of acute or severe chronic disease. 
4. 
Recent use of anthelmintic drug (within past 4 weeks). 
5. 
Attending other clinical trials during the study. 
6. 
Pregnancy, lactating, and/or planning to become pregnant within the next 6 months. 
7. 
Known allergy to study medications (i.e. albendazole, ivermectin or moxidectin). 
8. 
Taking medication with known interaction on study drugs. 
 
5.4 
Criteria for discontinuation of trial 
A subject can be discontinued from the study for the following reasons: 
1. 
Withdraws from the study (this can happen anytime as participation is voluntary and there are no 
further obligations once a participant withdraws).  
2. 
At the discretion of the Principal Investigator (PI) or co-PI, if the participant is not compliant to the 
requirements of the protocol. 
Discontinued subjects will not be replaced. If, for any reason, a subject is discontinued from the study 
before the end of treatment evaluations, the AE assessment will still be conducted. Data obtained prior 
to the withdrawal will be included in the analysis to ensure the validity of the trial. Data of withdrawn 
participants are fully anonymized once analysis is complete. 
 


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5.5 
Treatment of subjects 
After randomization, all eligible adolescents will be treated with the respective single or combination 
treatment regimen according to their assigned treatment arm at day 0. Albendazole will be the product 
of Glaxo Smith Kline (Zentel®) and a single tablet of 400 mg will be administered. Moxidectin tablets 
will be obtained from Medicines Development for Global Health (MDGH), Australia, and four tablets 
of 2 mg will be administered. Ivermectin tablets (3 mg) will be obtained from Merck (Stromectol®), 
and to administer a dose of 200 µg/kg, the body weight of each participant will be recorded to calculate 
and administer the correct dose of ivermectin.  
Since the study drugs are known to have an increased absorption in humans after a high-fat meal was 
consumed, participants will receive a local high-fat breakfast prior to treatment [16, 33, 34]. The tablets 
will be handed out from the drug container according to the randomization list. Each person will receive 
either: 
(i) 
A single tablet of albendazole plus four tablets of moxidectin 
(ii) 
A single tablet of albendazole plus the appropriate number of ivermectin tablets with regard to 
their body weight category  
(iii) 
A single tablet of albendazole  
(iv) 
The appropriate number of ivermectin tablets with regard to their weight category 
(v) 
Four tablets of moxidectin 
All drugs will be administered in the presence of the PI and/ co-PI, and ingestion confirmed. This will 
be recorded with the time and date of dosing. Subjects will be asked not to take any drugs other than 
those prescribed by the study medical team. After ingestion of the medication, the subjects will be 
observed for 3 hours to ensure retention of the drug. Vomiting within 1-hour post-dosing will require 
re-dosing. The subjects will not be allowed more than one repeated dose. No re-administration will be 
needed for subjects vomiting after one hour. The PI or the co-PIs are responsible for drug accountability 
at the study site. Maintaining drug accountability includes careful and systematic study drug storage, 
handling, dispensing, and documentation of administration. Prior to administration, drugs will be stored 
at room temperature and protected from light and exposure to moisture in a secure area with limited 
access at the study site. The tablets must not be frozen or stored at temperatures above 30°C. 
Temperature monitors must be used for shipment and storage. 
 
Treatment and capillary blood sampling (finger pricking) for the population PK and PK/PD assessment 
for a maximum of 60 study participants (maximum of 15 participants in the combination treatment arms 
and 10 participants in the monotherapy treatment arms) will be done in a quiet location at the school. 
Infrastructure as required for the study needs will be installed as necessary at the specific treatment days. 
 
 
 


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To avoid interference of potential on-going control programs against helminthiases with the infection 
status of the trial participants, communication with local stakeholders will be established to ascertain 
that trial participants will not undergo MDA treatment. Missed-out rounds of planned MDA against 
STH in the participating schools will be substituted with a free single-dose treatment (i.e., ivermectin 
200 µg/kg/ albendazole 400 mg ) against STH infection at the study endpoint (after the day 90 follow-
up assessment) offered by the study team. At each follow-up time point, participants will be asked 
whether they had taken anthelmintic treatment. 
 
5.6 
Concomitant therapy 
All medications taken one month before and during the study period until the last stool examination at 
the day 90 follow-up assessment must be recorded with indication, dose regimen, date and time of 
administration. 
Medication(s)/treatment(s) permitted during the trial: 
- Analgesics and antipyretics are allowed to be given to the subjects in case of fever, antiemetics to 
prevent nausea and vomiting and/or antibiotics to prevent or treat bacterial superinfection. 
Medication(s)/treatment(s) NOT permitted during the trial:  
- No other active drugs against helminths are permitted during the trial. Participants receiving active 
anthelminthic concomitant medication during the trial will not be discontinued, however a case-specific 
assessment will be done at the point of data-analysis. 
 
 
6. Safety assessments 
6.1 
Adverse event definitions 
The term “adverse event” is defined as follows: 
Any untoward medical occurrence in a patient or clinical investigation subject administered a 
pharmaceutical product and which does not necessarily have to have a causal relationship with this 
treatment 
An AE could therefore include any of the following events which develop or increase in severity during 
the course of the study after administration of the study product at treatment on day 0: 
a. Any unfavorable and unintended signs, symptoms or disease temporally associated with the use of a 
medicinal product, whether or not considered related to the condition under study and the study 
product 
b. Any abnormality detected during physical examination. 


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The medical conditions present at the initial trial visit that do not worsen in severity or frequency during 
the trial will not be defined as adverse events but considered as baseline medical conditions. For the 
purpose of this trial, disease progression and relapse will be considered as treatment failure, not as an 
Adverse Event.  
The observation time for adverse events starts when the treatment is initiated until the end of the study.  
These data will be recorded on the appropriate CRF sections, regardless of whether they are thought to 
be associated with the study or the drug under investigation. Associated with the use of the drug means 
that there is a reasonable possibility that the event may have been caused by the drug (see also 
relatedness definitions below). 
 
6.1.1 
Severity grading 
Adverse signs or symptoms will be graded by the physician or nurse of the trial as mild, moderate, 
severe or life threatening according to the following definitions:  
 
Grade 
Definition 
1 
Mild: the subject is aware of the event or symptom, but the event or symptom is 
easily tolerated. 
2 
Moderate: the subject experiences sufficient discomfort to interfere with or reduce 
his or her usual level of activity. 
3 
Severe: significant impairment of functioning: the subject is unable to carry out his 
or her usual activities. 
4 
Life threatening or disabling  
5 
Death related to adverse events 
6.1.2 
Relatedness 
Relatedness will be assessed as defined below based on the temporal relationship between the adverse 
event and the treatment, known side effects of treatment, medical history, concomitant medication, 
course of the underlying disease and trial procedures. 
Possibly related: an adverse event which can medically (pharmacologically/clinically) be attributed to 
the study treatment. 
Unrelated: an adverse even which is not reasonably related to the study treatment. A reasonable 
alternative explanation must be available. 
An adverse event that is determined to be related to the administration of a study product is referred to 
as an “adverse drug reaction.” 


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6.1.3 
Expectedness 
Expected adverse drug reaction: Any adverse event possibly related to the co-administration of 
ivermectin/ albendazole or moxidectin/ albendazole reported in the literature or on the drug package 
leaflets and listed in the consent form.  
Unexpected adverse drug reaction: Any adverse event possibly related to the study product 
administration, the nature, frequency, specificity or severity of which is unanticipated and not consistent 
with the available risk information described for these drugs.  
6.1.4 
Serious adverse events 
According to the ICH “Clinical Safety Data Management: Definitions and standards for expedited 
Reporting E2A” [35], a serious adverse event includes any event (experience) or reaction in any 
untoward medical occurrence that at any dose: 
1. results in death; 
2. is life threatening, meaning, the subject was, in the view of the Investigator, at 
immediate risk of death from the reaction as it occurred, i.e. it does not include a reaction 
that, had it occurred in a more serious form, might have caused death; 
3. results in persistent or significant disability/incapacity, i.e. the event causes a substantial 
disruption of a person’s ability to conduct normal life functions; 
4. requires in patient hospitalization or prolongation of existing hospitalization; 
5. creates a congenital anomaly or birth defect (not relevant for this study); 
6. is an important medical event, based upon appropriate medical judgment, that may 
jeopardize the patient or subject or may require medical or surgical intervention to 
prevent one of the other outcomes defining serious. 
 
A “severe” adverse event does not necessarily meet the criteria for a “serious” adverse event. Serious 
adverse events are reported from treatment until the end of the study.  
Serious adverse events that are still ongoing at the end of the study period will be followed up to 
determine the final outcome.  
The causality of any serious adverse event that occurs after the study period and its possible relatedness 
to the study treatment or study participation will also be assessed by investigators as described in section 
6.1.2. 
6.1.5 
Suspected unexpected serious adverse reactions 
A suspected unexpected serious adverse reaction (SUSAR) is an unexpected adverse drug reaction 
which also meets the definition of serious adverse events.  


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6.2 
Methods of recording and assessing adverse events 
Few adverse events have been reported following albendazole, ivermectin or moxidectin administration 
in STH-infected individuals. The most common adverse events were abdominal cramps, headache, 
fatigue, nausea, diarrhea, fever and vertigo [7, 8, 17, 36-38]. 
The observation time for AE starts when the treatment is initiated. Subjects will be kept for observation 
for at least 3 hours following treatment for any acute AE and. If there is any abnormal finding, the local 
study physician will perform a full clinical examination and findings will be recorded. An emergency 
kit will be available on site to treat any medical conditions that warrant urgent medical intervention. 
Participants will also be interviewed at 3h and 24h as well as retrospectively 14 -21 days, 5-6 weeks and 
3 months after treatment about the occurrence of AEs. 
Information on all AE (incidence, intensity, seriousness and causality) will be entered immediately in 
the source document, and also in the appropriate AE module of the case report form. For all AEs, 
sufficient information will be pursued and/or obtained so as to permit i) an adequate determination of 
the outcome of the event (i.e. whether the event should be classified as a SAE); and; ii) an assessment 
of the casual relationship between the AE and the study treatments. Intensity of AE will be judged by 
the study physician, following guidelines by the European Medicine Agency (Note for Guidance on 
Clinical Safety Data Management). 
 
All SAE, unexpected adverse drug reactions or SUSARs must be reported as described in Section 6.3. 
 
6.3 
Reporting of serious adverse events 
Any study-related unanticipated problem posing risk of harm to subjects or others (including all 
unexpected adverse drug reactions), and any type of serious adverse event (SAE) will be immediately 
(within a maximum of 24 hours after becoming aware of the event) notified to the study sponsor-
investigator and co-PIs: 
 
 
Prof. Dr. Jennifer Keiser (Sponsor-investigator) 
Swiss Tropical and Public Health Institute 
Socinstrasse 57, 4051 Basel, Switzerland 
Tel.: +41 61 284-8218 
Fax: +41 61 284-8105 
E-mail: jennifer.keiser@swisstph.ch 
 
 
 
 


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Mr. Said Ali (Co-PI) 
Public Health Laboratory Ivo de Carneri 
P.O. Box 122 Wawi, Chake Chake 
Pemba, Zanzibar (Tanzania) 
Tel.: +255 24 245-23 
Fax: +255 24 245-2003 
Mobile: +255 77 741-6867 
Email: saidmali2003@yahoo.com 
 
 
Within the following 48 hours, the local co-investigator must provide to study sponsor-investigator 
further information on the serious adverse event or the unanticipated problem in the form of a written 
narrative. This should include a copy of a completed SAE form, and any other diagnostic information 
that will assist the understanding of the event. In exceptional circumstances, a serious adverse event may 
be reported by telephone. In these cases, a written report must be sent immediately thereafter by fax or 
e-mail. Names, addresses and telephone for serious adverse event reporting will be included in the trial-
specific SAE form. Relevant pages from the CRF may be provided in parallel (e.g., medical history, 
concomitant medications). 
All pregnancies must be reported to the Sponsor-Investigator promptly after becoming aware of the 
pregnancy. Treatment will not be administered at follow-up time points in the event of pregnancy. A 
study physician recruited from a local health facility/ hospital will serve as medical contact. The treating 
physician will follow up on the study participant until the pregnancy is resolved. The outcome of the 
pregnancy must be reported to the Sponsor-Investigator. 
 
6.4 
Safety reporting to Health Authorities and Ethics Committees 
The sponsor-investigator will send appropriate safety notifications to Health Authorities in accordance 
with applicable laws and regulations. Additionally, this information will be provided to ‘Ethikkomission 
Nordwest- und Zentralschweiz’ (EKNZ, Switzerland), and the ‘Zanzibar Health Research Ethics 
Review Committee’ (ZAHREC, Tanzania) in Zanzibar according to national rules. Fatal or life-
threatening serious adverse events or SUSARs will be reported within 24 hours followed by a complete 
report within 7 additional calendar days. Other SAEs and SUSARs that are not fatal or life-threatening 
will be filed as soon as possible but no later than 14 days after first knowledge by the sponsor. 
 
 


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7. Data management and data quality control 
 
The investigators are responsible for an adequate data quality. Prior to the initiation of the study, a short 
investigator’s meeting will be held between investigators of Swiss TPH and PHL-IdC. This meeting will 
include a detailed discussion of the protocol, performance of study procedures (SOPs from previous 
studies available on site), CRF completion, specimen collection and diagnostic methods.  
Information about study subjects will be kept confidential and managed accordingly. Screened 
participants will be listed in a confidential “subject screening log” and attributed a unique study number. 
Enrolled participants will be listed in a confidential “subject enrolment log”; this document will 
constitute the only source to decode the pseudonymized data and will only be accessible to the 
investigators. CRF data will be double-entered and compared using Beyond Compare 4 (Scooter 
Software Inc., Madison, Wisconsin). Any discrepancies will be reviewed against the hard copies of the 
CRF and corrected accordingly. Electronic data files will be stored on secured network drives with 
restricted access for study personnel only. Data analysis will be conducted with pseudonymized data 
and reporting of findings will be fully anonymized.  
Essential infrastructure such as a locked room for safe storage of hardcopy data will be made available.  
 
7.1 
Source data 
Source data are comprised of clinical findings and observations as well as laboratory data maintained 
and compiled at the study site. Source data are contained in source documents and are allowed to be 
accessed by local authorities. Source data will be directly entered in the following documents: 
1. CRF: Primary data collection instrument for the study. It holds records of all clinical and 
physical examination data, treatment information, AEs, and infection status at the follow-up 
time points. For every subject enrolled in the clinical trial, a corresponding CRF exists. All data 
requested on the CRF must be recorded, and investigators will review and approve each CRF 
for completion. 
2. Laboratory parasitology sheets: Record of the STH egg counts at all sample collection time 
points 
3. PK: Time records of PK samplings for 60 willing participants 
 
 


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7.2 
Data collection and documentation 
Data collected and produced within this trial will fall into one of the following categories: 
a) Egg counts of T. trichiura, Hookworm (Necator americanus and Ancylostoma duodenale, no 
differentiation between the two species will be made) and A. lumbricoides derived from standard 
Kato-Katz microscopy performed at baseline as well as at 14-21 day, 5-6 weeks and 3 months 
post-treatment. 
b) Egg counts of T. trichiura, Hookworm and A. lumbricoides derived from FECPAK-G2 platform 
analysis at baseline and 14-21 days post-treatment.  
c) Anthropometric and clinical characteristics of the trial participants collected using the study’s 
CRF such as weight, height, blood pressure, temperature, pregnancy status (for female subjects), 
overall health status and any abnormal medical condition or chronic disease. 
d) PK time recording of each sample per person 
e) Measured concentrations analyzed from micro blood samples and subsequently derived PK/PD 
parameters 
f) Infection status of T. trichiura, Hookworm and A. lumbricoides derived by PCR assessment of 
ethanol-fixated stool sample aliquots 
 
Data of categories c) and d) will be recorded both paper-based and directly into tablets using CommCare  
(Dimagi, Inc., Cambridge, MA) or a comparable data-entry software, whereas data in categories a), b) 
and e) will be captured by software only. Data compiled using the software will be directly saved on the 
personal, password-protected laptop of one of the Co-PIs and uploaded to a server hosted at Swiss TPH, 
Basel. In paper-based data collection, all missing data must be explained. If an item on the CRF is left 
blank because the procedure was not done or the question was not asked “N/D” will be entered. If the 
item is not applicable to the individual case “N/A” will be written. All entries will be printed in black 
ink. All corrections must be noted with the initials of the respective team member and dated. Data in 
categories a) and c) will be merged into a masterfile and saved in .xlsx, .mdb and/or .csv. Data in 
categories b) and d) - f) will be saved as .mdb, .csv, .xlsx, .txt and/or .pdf files. For categories a) – d), 
paper-based data will serve as physical backup. Hard copies of the data such as parasitological sheets 
and CRFs will remain at PHL-IdC. Digital copies along with single databases and compiled masterfiles 
will be transferred to the Swiss TPH, Basel. Data will then be analyzed as described in section 8. 
 
 


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7.3 
Ethical, legal and security issues 
Screened participants will be listed in a confidential “subject screening log” and attributed a unique 
study ID. In case of enrolment, participants will be listed in a confidential “subject enrolment log” 
utilizing the same study IDs. The codes will be linked with the participant’s identity on a separate file 
(subject identification list), filed in a secured place at PHL-IdC and will only be accessible to 
investigators. Personal data will be coded for data analysis. No names will be published at any time, and 
published reports will not allow for identification of single subjects. Confidentiality will be ensured 
throughout the entire research project. All databases will be password secured. None of the investigators 
declare to have any conflicts of interest. 
 
7.4 
Data storage and preservation 
All samples will be destroyed after completion of the study. Paper-based and electronic source data and 
related material will be preserved for a minimum of 15 years to enable understanding of the study 
procedures, which allows the work to be assessed retrospectively and repeated if necessary. The study 
site will retain a copy of the documents to ensure that local collaborators can provide access to the source 
documents to a monitor, auditor, or regulatory agency. Electronic source documents will be stored on a 
flash drive and kept at the study site (IdC PHL, Pemba, Tanzania). The primary data storage and backup 
will be in the Swiss TPH shared server and secondary data storage will be on personal, password-
protected laptops of Jennifer Keiser, Sophie Welsche and Said Ali, and on SWICTHdrive (a cloud 
storage supported by University of Basel). Electronic data files and archiving conditions will be made 
strictly confidential by password protection. 
 
7.5 
Study documents: translations – reference language 
- 
The protocol master document will be in English, all further language versions are translated 
thereof 
- 
The ICF master document will be in English, all language versions are translated thereof. 
 
 
8. Statistics 
8.1 
Definition of primary endpoint 
Egg reduction rate calculated from the geometric means of co-administered moxidectin/ albendazole 
and ivermectin/ albendazole against T. trichiura assessed at 14-21 days post-treatment is the primary 
endpoint in our study.   
 


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8.2 
Justification of number of trial subjects  
For the primary analysis the trial is designed as 2 arm parallel group randomized-controlled trial. We 
test the primary hypothesis that the treatment combination moxidectin and albendazole is not inferior 
compared to ivermectin and albendazole. To determine the required sample size, we run a series of 
simulation using artificial data which behaved roughly in the same way as found by [7].   Assuming true 
ERR of 98% in both arms and 98.5% in both arms, we estimate that 160 participants are required in 
each group to be at least 90% sure that the limits of a two-sided 95% confidence interval will exclude a 
difference in favor of the standard group of more than 2 percentage points. To account for a potential 
loss to follow-up of 10% and including a safety margin of 20% to account for uncertainty in our 
assumptions underlying the simulations, we anticipate enrolling 210 participants in each combination 
treatment arm (arm A and B). Secondary hypothesis will compare monotherapies against the 
combinations. Assuming cure rates below 25% for albendazole and ivermectin and 40% for moxidectin 
monotherapy respectively, we need to enroll 20, 20 and 80 children, respectively, to identify a statistical 
significant difference with 85 to 90% power (arm C, D, E) [1, 5, 8, 39]. We thus aim to recruit 210 + 
210 + 20 + 20 + 80 = 540 participants in total.  
 
The suggested sample size of a maximum of 4 PK samples from 60 willing participants (10-15 per study 
arm) is sufficiently high to determine the population PK parameters and investigate drug-drug 
interactions with a sparse sampling scheme, considering that PK variability is moderate. A moderate PK 
variability is a reasonable assumption when dealing with adolescents.   
 
 
8.3 
Description of statistical methods 
In non-inferiority trials, non-inferiority has to be demonstrated in the intention-to-treat and in the per 
protocol population. The primary analysis will be performed according to the intention-to-treat 
principles using the available case population which includes all participants with any primary end point 
data. Subsequently, a per-protocol analysis will be performed. EPG will be assessed by calculating the 
mean egg count from the quadruplicate Kato-Katz thick smears and multiplying this number by a factor 
of 24. The ERR will be calculated as: 
 
𝐸𝑅𝑅=  1 − 
1
𝑛 𝑒 ∑log(𝐸𝑃𝐺𝑓𝑜𝑙𝑙𝑜𝑤−𝑢𝑝 + 1) −1
1
𝑛 𝑒 ∑log(𝐸𝑃𝐺𝑏𝑎𝑠𝑒𝑙𝑖𝑛𝑒 + 1)      −1  
 


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Geometric mean egg counts will be calculated for the different treatment arms before and at 14-21 days 
after treatment to assess the corresponding ERRs. Bootstrap resampling method with 5,000 replicates 
will be used to calculate 95% confidence intervals (CIs) for ERRs and the difference between the ERRs. 
CRs will be calculated as the percentage of egg-positive children at baseline who become egg-negative 
after treatment. Differences among CRs will be assessed by using unadjusted logistic regressions. In a 
subsequent analysis an adjusted logistic regression (adjustment for baseline infection intensity, age, sex, 
weight) will be performed.  
Questionnaires on physical functioning and treatment satisfaction will be evaluated by creating 
summary scores by summing up and transforming the single question scores according to the following 
formula: [(actual raw score-lowest possible raw score)/(possible raw score range)]*100 [40]. 
Adverse events will be summarized in frequency tables and compared between treatment groups using 
descriptive statistics.  
To assess differences in diagnostic performance of the different tools used as compared to the standard 
Kato-Katz microscopy (FECPAK-G2 and/or PCR) a readily available hierarchical Bayesian egg-count 
model will be applied to the individual level data. 
A nonlinear mixed-effects (NLME) modelling will be used to determine pharmacokinetic parameters. 
Concentrations are measured with a validated LC-MS/MS method [20, 31]. Using NLME, the key 
population PK parameters will be calculated based on which an effect on the drug-drug interaction will 
be determined:  
 
Cmax 
maximal plasma concentration 
 
tmax 
time to reach Cmax 
 
AUC area under the curve, from 0 to 24h and 0 to inf. 
 
t1/2 
elimination half-life 
Cmax and tmax will be observed values derived from the plasma concentration-time profile. Total drug 
exposure (AUC) and t1/2 will be calculated with the NLME modeling software Monolix 2018R2 (Lixoft, 
Antony, France) using compartmental analysis. The elimination half-life will be estimated by the 
equation: t1/2 = ln2/, where  (the elimination rate constant) will be determined by performing a 
regression of the natural logarithm of the concentration values during the elimination period. Primary 
PK parameters including absorption rate (ka), volume of distribution (V), and clearance (CL) will be 
estimated utilizing NLME modeling.  
The exact design of the sparse sampling scheme will depend on the results of current PK trials of our 
group. Optimization in nonlinear regression will be based on the Fisher information matrix MF. Number 
of groups, subjects per group, samples per subjects and sampling times in each group will be adjusted 
to maximize the determinant of the Fisher matrix and hence minimizing the standard errors (SE < 25%).  
 
 


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9. Duties of the investigator  
9.1 
Investigator’s confirmation 
This trial will be conducted in accordance with the protocol, International Conference on Harmonisation 
Good Clinical Practice E6 (R2) (ICH-GCP) and the current version of the Helsinki Declaration. 
All protocol modifications must be documented in writing. A protocol amendment can be initiated by 
either the Sponsor/PI or any Investigator. The Investigator will provide the reasons for the proposed 
amendment in writing and will discuss with the Sponsor/PI and Co-PIs. Any protocol amendment must 
be approved and signed by the Sponsor/PI and must be submitted to the appropriate Independent Ethics 
Committee (IEC) for information and approval, in accordance with local requirements, and to regulatory 
agencies if required. Approval by IEC must be received before any changes can be implemented, except 
for changes necessary to eliminate an immediate hazard to trial subjects, or when the change involves 
only logistical or administrative aspects of the trial, e.g. change of telephone number(s). 
 
9.2 
Damage coverage 
A general liability insurance of the Swiss TPH is in place (Winterthur Police Nr. 4746321) and 
participant liability insurances will be issued in Pemba (Tanzania). 
 
9.3 
Project management 
The trial team will include the PI (Prof. Jennifer Keiser), five Co-PIs (Mr. Said Mohammed Ali, Mr. 
Ghanil Mohamed Khatib, Dr. Daniela Hofmann, Ms Sophie Welsche and Mr. Emmanuel Mrimi), a trial 
statistician (Dr. Jan Hattendorf), as well as two local physicians and several laboratory technicians. Prof. 
Jennifer Keiser, Mr. Said Mohammed Ali, Mr. Ghanil Mohamed Khatib, Ms. Sophie Welsche and Mr. 
Emmanuel Mrimi will be responsible for staff management, communication with the collaborative 
group, recruitment monitoring, data management, safety reporting, analysis, report writing and 
dissemination of the trial results. Mr. Said Mohammed Ali and Mr. Ghanil Mohamed Khatib are 
responsible for supervision of the lab- and field technicians, staff management, recruitment monitoring, 
supply of the material, contact to the local authorities and participating schools.  
The investigator team is responsible for ensuring that the protocol is strictly followed. The investigator 
should not make any changes without the agreement of the Principal Investigator and the Co-
Investigators, except when necessary to eliminate an apparent immediate hazard or danger to a study 
participant. The investigator will work according to the protocol and GCP. The investigator may take 
any steps judged necessary to protect the safety of the participants, whether specified in the protocol or 
not. Any such steps must be documented. During the treatment, the records are maintained by the 
responsible medical doctor. All entries have to be made clearly readable with a pen. The investigator 
must be thoroughly familiar with the properties, effects and safety of the investigational pharmaceutical 
product. 


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10. Ethical considerations 
10.1 
Independent Ethics Committee (IEC) 
The study will be submitted for approval by the institutional research commission of the Swiss TPH and 
the ethical committees of Switzerland and Zanzibar. The study will be undertaken in accordance with 
the Declaration of Helsinki and good clinical practice (GCP). 
10.2 
Evaluation of the risk-benefit ratio 
Albendazole, ivermectin, and moxidectin are well-known drugs and have little and mainly mild adverse 
events as described to date (headache, abdominal pain etc.). Albendazole and ivermectin are widely used 
drugs in mass treatment programs against filariasis and moxidectin is an FDA-approved drug against 
onchocerciasis. All community members enrolled in the study will benefit from a clinical examination 
and a treatment against STHs. All participating subjects remaining positive for T. trichiura will be 
treated with ivermectin (200 μg/kg)/ albendazole (400 mg), considering this combination showed higher 
efficacy compared to the existing standard treatment (albendazole alone) and the recent inclusion of 
ivermectin as recommended treatment scheme on the Essentials Medicines List [4]. 
 
10.3 
Subject information and consent 
All parents or caregivers of eligible adolescents and all participants <18 years will be asked to sign a 
written informed consent sheet. In case the person is illiterate, an impartial witness that can read and 
write has to sign the consent and the illiterate participant has to give a thumb print. Parents or caregivers 
and adult participants will have sufficient time for reflection of their child’s or their own participation, 
respectively. Additionally, adolescent children (aged 12-17 years) will be briefed verbally, and written 
assent will be sought in form of their name written down or if illiterate by providing a thumb print.  
Information sessions at the respective schools will be conducted to explain to caregivers and potential 
participants the purpose and procedures of the study. Parents or caregivers attending this meeting will 
receive a small provision to cover their costs for transportation (~US$ 2). One of the parents/caregiver 
of an eligible individual will be asked to sign a written informed consent form (translated into the local 
language, i.e. Kiswahili) after having had sufficient time for reflection of their child’s participation. 
Adolescents will be asked orally for assent. Participation is voluntary and individuals have the right to 
withdraw from the study at any given point in time with no further obligations. Participation itself will 
not be awarded with compensation. 
 
 


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10.4 
Subjects requiring particular protection 
Our study will include school-based adolescents, since T. trichiura infection occurs often in children 
and adolescents; hence this age group is at high risk of infection. Pharmacokinetic/-dynamic and non-
inferiority studies have not been conducted to date in this population between co-administration of 
ivermectin and albendazole against co-administration of moxidectin and albendazole. Our trial will 
produce more evidence to support the search for a safe and effective treatment of STH infections in 
adolescents and whole community. 
 
11. Quality control and quality assurance 
11.1 
Monitoring and auditing 
We will work with a locally based external monitor. He/she will conduct site visits to the investigational 
facilities for the purpose of monitoring the study. Details will be described in a separate monitoring plan. 
The investigator will permit them access to study documentation and the clinical supplies dispensing 
and storage area. Monitoring observations and findings will be documented and communicated to 
appropriate study personnel and management. A corrective and preventative action plan will be 
requested and documented in response to any significant deviation. No sponsor-initiated audits are 
foreseen, but audits and inspections may be conducted by the local regulatory authorities or ethics 
committees. The investigator agrees to allow inspectors from regulatory agencies to review records and 
is encouraged to assist the inspectors in their duties, if requested. 
 
11.2 
Data and safety monitoring board (WHO) / data monitoring committee (EU/FDA) 
In our study, no data and safety monitoring board will be established, since we work with well-known 
drugs in a small sample size and using a single dose treatment. However, advisors will be informed 
regularly and the findings discussed.  
 
12. Dissemination of results and publication 
The final results of this study will be published in a scientific journal and presented at scientific 
conferences. BMGF will be acknowledged as study funder. All results from this investigation are 
considered confidential and shall not be made available to any third party by any member of the 
investigating team before publication. A summary of study conclusions will be shared with ZAHREC. 
After publication, study results will be made available to study participants.


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helminths: systematic review and network meta-analysis. BMJ, 2017. 358: p. j4307. 
2. 
Farrell, S.H., et al., Investigating the Effectiveness of Current and Modified World Health 
Organization Guidelines for the Control of Soil-Transmitted Helminth Infections. Clin Infect 
Dis, 2018. 66(suppl_4): p. S253-S259. 
3. 
Hughes, D. and D.I. Andersson, Evolutionary consequences of drug resistance: shared 
principles across diverse targets and organisms. Nat Rev Genet, 2015. 16(8): p. 459-71. 
4. 
WHO, The selection and use of essential medicines: report of the 21st WHO Expert Committee, 
in WHO Technical Report Series. 2017, World Health Organization: Geneva. 
5. 
Palmeirim, M.S., et al., Efficacy and safety of co-administered ivermectin plus albendazole for 
treating soil-transmitted helminths: A systematic review, meta-analysis and individual patient 
data analysis. PLoS Negl Trop Dis, 2018. 12(4): p. e0006458. 
6. 
Patel, C., et al., Efficacy and safety of ivermectin and albendazole co-administration in school-
aged children and adults infected with Trichuris trichiura: study protocol for a multi-country 
randomized controlled double-blind trial. BMC Infect Dis, 2019. 19(1): p. 262. 
7. 
Barda, B., et al., Efficacy and tolerability of moxidectin alone and in co-administration with 
albendazole and tribendimidine versus albendazole plus oxantel pamoate against Trichuris 
trichiura infections: a randomised, non-inferiority, single-blind trial. Lancet Infect Dis, 2018. 
18(8): p. 864-873. 
8. 
Keller, L., et al., Efficacy and safety of ascending dosages of moxidectin and moxidectin-
albendazole against Trichuristrichiura in adolescents: a randomized controlled trial. Clin 
Infect Dis, 2019. 
9. 
Keller, L., et al., Efficacy and safety of ascending dosages of moxidectin and moxidectin-
albendazole against Trichuris trichiura in adolescents: a randomized controlled trial. Clin 
Infect Dis, 2019. 
10. 
Prichard, R.K. and T.G. Geary, Perspectives on the utility of moxidectin for the control of 
parasitic nematodes in the face of developing anthelmintic resistance. Int J Parasitol Drugs Drug 
Resist, 2019. 10: p. 69-83. 
11. 
Korth-Bradley, J.M., et al., Excretion of moxidectin into breast milk and pharmacokinetics in 
healthy lactating women. Antimicrob Agents Chemother, 2011. 55(11): p. 5200-4. 
12. 
Opoku, N.O., et al., Single dose moxidectin versus ivermectin for Onchocerca volvulus infection 
in Ghana, Liberia, and the Democratic Republic of the Congo: a randomised, controlled, 
double-blind phase 3 trial. Lancet, 2018. 392(10154): p. 1207-1216. 
13. 
Schulz, J.D., et al., Pharmacokinetics of ascending doses of ivermectin in Trichuris trichiura-
infected children aged 2-12 years. J Antimicrob Chemother, 2019. 74(6): p. 1642-1647. 
14. 
Geary, T.G., et al., Unresolved issues in anthelmintic pharmacology for helminthiases of 
humans. Int J Parasitol, 2010. 40(1): p. 1-13. 
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Oshikoya, K.A., H.M. Sammons, and I. Choonara, A systematic review of pharmacokinetics 
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16. 
Korth-Bradley, J.M., et al., The effect of a high-fat breakfast on the pharmacokinetics of 
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17. 
Cotreau, M.M., et al., The antiparasitic moxidectin: safety, tolerability, and pharmacokinetics 
in humans. J Clin Pharmacol, 2003. 43(10): p. 1108-15. 
18. 
Grossenbacher, B., et al., Molecular methods for tracking residual Plasmodium falciparum 
transmission in a close-to-elimination setting in Zanzibar. Malaria Journal, 2020. 19(1): p. 50. 
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Rowland, M. and G.T. Emmons, Use of dried blood spots in drug development: 
pharmacokinetic considerations. Aaps j, 2010. 12(3): p. 290-3. 
20. 
Schulz, J.D., et al., Development and validation of a LC-MS/MS method for ivermectin 
quantification in dried blood spots: application to a pharmacokinetic study in Trichuris 
trichiura-infected adults. Analytical Methods, 2018. 10(24): p. 2901-2909. 


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Barnes, E.H., et al., Selection of different genotype larvae and adult worms for anthelmintic 
resistance by persistent and short-acting avermectin/milbemycins. Int J Parasitol, 2001. 31(7): 
p. 720-7. 
22. 
Oxford Policy Management, Mapping of school capacity to absorb out-of-school children in 
Zanzibar: A review of school capacity, school inclusiveness, and reasons why children are out 
of school. 2018. 
23. 
MDGH & TDR, U.S. FDA approves moxidectin for the treatment of river blindness. 2018, 
Medicines Development for Global Health and the World Health Organization Special 
Programme for Research and Training in Tropical Diseases: Melbourne, Geneva and New York. 
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Katz, N., A. Chaves, and J. Pellegrino, A simple device for quantitative stool thick-smear 
technique in schistosomiasis mansoni. Rev Inst Med Trop Sao Paulo, 1972. 14(6): p. 397-400. 
25. 
Mejia, R., et al., A novel, multi-parallel, real-time polymerase chain reaction approach for eight 
gastrointestinal parasites provides improved diagnostic capabilities to resource-limited at-risk 
populations. Am J Trop Med Hyg, 2013. 88(6): p. 1041-7. 
26. 
Moser, W., et al., Diagnostic comparison between FECPAKG2 and the Kato-Katz method for 
analyzing soil-transmitted helminth eggs in stool. PLoS Negl Trop Dis, 2018. 12(6): p. 
e0006562. 
27. 
Ayana, M., et al., Modification and optimization of the FECPAKG2 protocol for the detection 
and quantification of soil-transmitted helminth eggs in human stool. PLoS Negl Trop Dis, 2018. 
12(10): p. e0006655. 
28. 
Campbell, S.J., et al., A Critical Appraisal of Control Strategies for Soil-Transmitted Helminths. 
Trends Parasitol, 2016. 32(2): p. 97-107. 
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Strunz, E.C., et al., Water, sanitation, hygiene, and soil-transmitted helminth infection: a 
systematic review and meta-analysis. PLoS Med, 2014. 11(3): p. e1001620. 
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Kepha, S., et al., Impact of single annual treatment and four-monthly treatment for hookworm 
and Ascaris lumbricoides, and factors associated with residual infection among Kenyan school 
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31. 
Schulz, J.D., et al., Pharmacokinetics of Albendazole, Albendazole Sulfoxide, and Albendazole 
Sulfone Determined from Plasma, Blood, Dried-Blood Spots, and Mitra Samples of Hookworm-
Infected Adolescents. Antimicrob Agents Chemother, 2019. 63(4). 
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assessment of severity (WHO/NMH/NHD/MNM/11.1). 2011, Vitamin and Mineral Nutrition 
Information System: Geneva. 
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Guzzo, C.A., et al., Safety, tolerability, and pharmacokinetics of escalating high doses of 
ivermectin in healthy adult subjects. J Clin Pharmacol, 2002. 42(10): p. 1122-33. 
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Pawluk, S.A., et al., A review of pharmacokinetic drug-drug interactions with the anthelmintic 
medications albendazole and mebendazole. Clin Pharmacokinet, 2015. 54(4): p. 371-83. 
35. 
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Pharmaceuticals for Human Use: ICH Harmonised Tripartite Guideline. Clinical Safety Data 
Management: definition and standards for expedited reporting E2A. 1994. 
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Knopp, S., et al., Albendazole and mebendazole administered alone or in combination with 
ivermectin against Trichuris trichiura: a randomized controlled trial. Clin Infect Dis, 2010. 
51(12): p. 1420-8. 
37. 
Ndyomugyenyi, R., et al., Efficacy of ivermectin and albendazole alone and in combination for 
treatment of soil-transmitted helminths in pregnancy and adverse events: a randomized open 
label controlled intervention trial in Masindi district, western Uganda. Am J Trop Med Hyg, 
2008. 79(6): p. 856-63. 
38. 
Speich, B., et al., Efficacy and safety of albendazole plus ivermectin, albendazole plus 
mebendazole, albendazole plus oxantel pamoate, and mebendazole alone against Trichuris 
trichiura and concomitant soil-transmitted helminth infections: a four-arm, randomised 
controlled trial. Lancet Infect Dis, 2015. 15(3): p. 277-84. 
39. 
Moser, W., C. Schindler, and J. Keiser, Chapter Five - Drug Combinations Against Soil-
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Fürst, T., et al., Questionnaire-based approach to assess schoolchildren's physical fitness and 
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ICF_001.pdf: 
ICF - Efficacy and safety of MOX/ALB vs. IVM/ALB co-administration v1.0/15.06.2020 (ref prot v1.1_07_10_2020)  
Informed Consent Form 
 
 
Page 1 of 4 
 
Study participant information and consent sheet 
 
 
Efficacy and safety of moxidectin and albendazole compared to ivermectin and 
albendazole co-administration in adolescents infected with Trichuris trichiura: a 
randomized controlled trial 
 
Version 1.0, Date: 15th June 2020  
 
This study is jointly undertaken by researchers from the following institutions:  
- Public Health Laboratory-Ivo de Carneri (PHL-IdC), Pemba, Tanzania 
- Swiss Tropical and Public Health Institute (Swiss TPH), Basel, Switzerland 
 
Principal investigators: The following persons are directly responsible for the design and the implementation 
of the study: Mr. Said Ali (CEO PHL-IdC), Mr. Ghanil Mohamed Khatib (PHL-IdC), Prof. Dr. Jennifer Keiser 
(Swiss TPH), Dr. Daniela Hofmann (Swiss TPH), Ms. Sophie Welsche (Swiss TPH) and Mr. Emmanuel 
Mrimi (Swiss TPH). 
 
Why is this study being done? Parasitic worms are living in the bellies and can cause poor nutrition, slower 
development of the body and the mind, and reduced work performance. On Pemba Island most children are 
infected with one or several different types of parasitic worms. Since children suffer the most from having 
these worms in their bellies, they receive drugs to kill these worms at school. However, the most widely used 
drug does not work very well. We would like to find out whether giving the current drug together with a second 
drug kills the worms in your/your child’s body better and how you/your child feel/feels shortly after taking this 
drug combination.  
 
What is the aim of this study? The aim of this study is to look at how well the currently used drug 
(albendazole) in combination with another drug (ivermectin or moxidectin) kills the worms in the people’s 
bodies. 540 adolescents (12-19 years of age) going to schools on Pemba Island and with worms will be treated 
and then revisited three times over a period of three months to see if the participant’s health improved. 
 
Can I decide if I/my child participate/s? Yes. You are free to decide, whether you/your child participate/s in 
this study. 
 
What will I/my child have to do if I/he/she participate/s? You/your child will be asked to provide 2 stool 
samples in the morning to check if you/he/she has the worm Trichuris trichiura or other worms. If you/your 
child have/has T. trichiura and are/is willing to participate in the study, you/your child will be assigned by 
chance to one of the different treatment groups (ivermectin-albendazole, moxidectin-albendazole, 
albendazole alone, ivermectin alone, moxidectin alone). You/your child will not know to which treatment 
you/your child will be receiving.  
 
 


ICF - Efficacy and safety of MOX/ALB vs. IVM/ALB co-administration v1.0/15.06.2020 (ref prot v1.1_07_10_2020)  
Informed Consent Form 
 
 
Page 2 of 4 
Before treatment, a doctor and nurses will check your/your child’s health. For this, they will check that you/your 
child are healthy enough to participate and ask for a small finger blood sample to ensure that you/your child 
are/is not suffering from a lack of blood. To avoid accidental treatment of pregnant girls/women, we will ask 
all female participants to provide a urine sample to do a pregnancy test. Before giving the treatment, we will 
provide you/your child with a meal so nobody who takes the pills will have an empty stomach. Since you/ your 
child will spend several hours with our team on the day of treatment, we will provide all participants with 
another meal. 
During and after treatment a medical team will monitor your/your child’s condition, which includes a physical 
examination. The medical team will ask you/your child about symptoms and discomfort before treatment and 
3 hours, 24 hours and 3 weeks after treatment. Three weeks, 5-6 weeks and 3 months after the treatment, 
we will ask you/your child again to provide 2 stool samples to check whether all worms have been killed. 
We will ask 60 willing people to provide a few drops of blood from the fingertip. We will ask each of these 
participants to give us 4 blood samples. The blood sample is given by finger prick and done by a medical team 
member between the day of treatment and 7 days after. Your blood sample will help us see how the drug 
behaves in your body and can help to find the best treatment to kill the worms. If we still find worms in your/your 
child’s stool at the end of the study, you/your child will receive the standard treatment again. We would also 
like to store a small portion of your stool sample for further analysis to improve our understanding and 
treatment of parasitic worm infections. 
 
What are the risks and benefits of this study? The drug dose you/your child will receive might cure or 
reduce worm infections. The drugs can sometimes have some unwanted effects for your well-being, however, 
until now, researchers have reported only mild effects that usually go away/resolve within a few hours. The 
drugs might cause you/your child to feel dizziness, headache, stomachache or itching skin. If we detect other 
types of worms in your/your child’s belly or if we find abnormal medical conditions, you/your child will get the 
appropriate care after the clinical examination. Before taking your/your child’s blood sample from the fingertip, 
we will always disinfect the skin and only use sterile disposable finger pricks to avoid any risk of infection. This 
procedure is well tolerated too. The results of this study will help to identify better treatment options for all 
populations in the world who suffer from worm infections. 
 
Who will have access to the personal information of myself/my child? Doctors and scientists from the 
institutions organizing and coordinating the research (Swiss TPH, Public Health Laboratory Ivo de Carneri or 
from Health Authorities) may review the results of this research, including your/your child’s patient files. 
However, your/his/her personal information (name, birth date, health conditions, etc.) will not be shared with 
anybody else. The data will be coded with an identification number (encryption). This number replaces your 
name and date of birth so that nobody can identify your person. Data and related material will be kept for 15 
years so that everything that was done is still understandable later. 
 
Participation/withdrawal: Participation in this study is entirely voluntary. You are free to withdraw yourself/ 
your child from the study at any moment without further obligations. You/your child will not lose any benefit 
and will receive free treatment (albendazole and ivermectin). 
 
What are the costs to me? Will I receive any payment? Participation in this study will not result in any costs 
to you. The treatment for any of the diagnosed worms including retreatment, if necessary, is free. Participants 
will not receive any money or other compensation except the free treatment of all diagnosed worms. 
 
Contact person for further questions and complaints: If you have any questions or complaints or if you 
want to know the health status of yourself/ your child, you can ask the fieldworkers who will try to answer them 
or transfer them to one of the principal investigators. You may contact any time directly Mr. Said Ali (PHL-
IdC), Tel 0777 416 867.  For any ethical inquiries, please contact ZAHREC Secretariate (Zanzibar Health 
and Research Ethical Committee, Phone number: 0776 264 880).


ICF - Efficacy and safety of MOX/ALB vs. IVM/ALB co-administration v1.0/15.06.2020 (ref prot v1.1_07_10_2020)  
Informed Consent Form 
 
 
Page 3 of 4 
 
  
 
 
 
Informed Consent Form         
  
 
ID
 
              
(Kept by caregiver / adult participant) 
I have read and got an explanation about/ Somebody has read and translated for me the information sheet. I 
understand what will be done during the study, how it will be done, what I/my child will do and I know of the risks and 
benefits associated with the study. I got answers to all my questions. I also know that I can stop my participation or that 
of my child at any time without any disadvantage or explanation. 
 
Therefore,  
I agree, that my child participates in this study (if participant is < 18 years old) 
I agree to participate in this study (if participant is 18 - 19 years old) 
I agree that my/my child’s stool sample may be stored for further analysis  
 
Name of caregiver or adult participant:  
 
_________________________________________________________________________ 
 
 
Signature ______________________________________________________ or thumbprint 
 
If Illiterate: I have witnessed the accurate reading of the consent form to the caregiver/ adult participant and the 
individual has had the opportunity to ask questions. I confirm that the individual has given consent freely. 
 
Name of witness: ______________________________________________  Signature ________________________ 
__ __ __ __ 
 
Name of study team member: ____________________________________________________________________ 
 
 
Date _____/_____/20___ Signature _________________________________________________________________ 
Assent of minor participant: 
I have read this information/ I have had the information read to me. I understand the meaning of this information. I 
have had my questions answered and know that I can ask questions later if I have them. By signing this form, I agree to 
participate in the study. I also understand that I am free to withdraw from the study at any time without any disadvantage 
or explanation. 
 
Name of minor participant:  
 
_________________________________________________________________________ 
 
 
Signature ______________________________________________________ or thumbprint 
 
If Illiterate: I have witnessed the accurate reading of the consent form to the caregiver/ adult participant and the 
individual has had the opportunity to ask questions. I confirm that the individual has given consent freely. 
 
Name of witness: ______________________________________________  Signature ________________________ 
 
Date _____/_____/20___ 


ICF - Efficacy and safety of MOX/ALB vs. IVM/ALB co-administration v1.0/15.06.2020 (ref prot v1.1_07_10_2020)  
Informed Consent Form 
 
 
Page 4 of 4 
 
Informed Consent Form 
 
 
 
ID 
(Kept Co-PI) 
__ __ __ __ 
I have read and got an explanation about/ Somebody has read and translated for me the information sheet. I 
understand what will be done during the study, how it will be done, what I/my child will do and I know of the risks and 
benefits associated with the study. I got answers to all my questions. I also know that I can stop my participation or that 
of my child at any time without any disadvantage or explanation. 
 
Therefore,  
I agree, that my child participates in this study (if participant is < 18 years old) 
I agree to participate in this study (if participant is 18 - 19 years old) 
I agree that my/my child’s stool sample may be stored for further analysis  
 
Name of caregiver or adult participant:  
 
_________________________________________________________________________ 
 
 
Signature ______________________________________________________ or thumbprint 
 
If Illiterate: I have witnessed the accurate reading of the consent form to the caregiver/ adult participant and the 
individual has had the opportunity to ask questions. I confirm that the individual has given consent freely. 
 
Name of witness: ______________________________________________  Signature ________________________ 
 
Name of study team member: ____________________________________________________________________ 
 
 
Date _____/_____/20___ Signature _________________________________________________________________ 
Assent of minor participant: 
I have read this information/ I have had the information read to me. I understand the meaning of this information. I 
have had my questions answered and know that I can ask questions later if I have them. By signing this form, I agree to 
participate in the study. I also understand that I am free to withdraw from the study at any time without any disadvantage 
or explanation. 
 
Name of minor participant:  
 
_________________________________________________________________________ 
 
 
Signature ______________________________________________________ or thumbprint 
 
If Illiterate: I have witnessed the accurate reading of the consent form to the caregiver/ adult participant and the 
individual has had the opportunity to ask questions. I confirm that the individual has given consent freely. 
 
Name of witness: ______________________________________________  Signature ________________________ 
 
Date _____/_____/20___