Spatial Repellent Products for the Control of Vector Borne Diseases - Malaria - Tanzania

Study Overview
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Brief Summary
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The primary objective of the study is to demonstrate and quantify the protective efficacy (PE) of spatial repellent products in reducing the incidence of malaria infection in human cohorts. The null hypothesis (H0) is that there is no difference in malaria incidence between intervention and control arms.

Detailed Description
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The primary epidemiological endpoint will be the incidence density of first time malaria infections among human cohorts during the follow-up period as detected by polymerase chain reaction assay (PCR). This measure will inform PE (the reduction of incidence) between intervention and control study arms using the formula: PE =[(Ip - Ia)/Ip]* 100%; based on an expected minimum effect size of 30%. First time infections in these subjects will offer relatively unambiguous evidence of the extent of exposure to infectious mosquito bites. The primary entomological endpoint will be adult densities of vector species via human-landing catch (HLC) from sentinel households from intervention and control arms over the follow-up period. Secondary epidemiological endpoints will be the incidence density of first time malaria infections among human cohorts during the follow-up period as detected by microscopy and the total number of cases averted (i.e., all Plasmodium spp. infections in cohort subjects). Secondary entomological endpoints include number of sporozoite infected mosquitoes, parity and species-specific effects of the spatial repellent product. Both epidemiological and entomological endpoints will be utilized to look at the relationship between SR and PE based on product coverage (to include diversion and community effects) and insect behavior. The prospect of SR associated temporal cumulative effects on study endpoints (epidemiological and entomological) over transmission seasons will also be investigated by using the cumulative incidence of infection over the season and applying a survival curve analysis of the cohort data.

Official Title
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Spatial Repellent Products for the Control of Vector Borne Diseases - Malaria - Tanzania

Conditions
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Malaria

Intervention / Treatment
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* Device: Spatial Repellent product with active ingredient
* Device: Active ingredient
* Device: Spatial Repellent product without active ingredient (SHIELD)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Children aged 6-59 months glucose-6-phosphate dehydrogenase (G6PD) normal (qualitative screen) in sites where P. vivax or P. ovale known prevalence rates represent major burden) and whose treatment with primaquine is implemented within national guidelines Hb > 5mg/dl Temperature ≤38.0°C) and no moderate or severe acute illness/infection on the day of inclusion Sleeps in cluster >90% of nights during any given month No plans for extended travel (<1month) outside of home during study Not participating in another clinical trial investigating a vaccine, drug, medical device, or a medical procedure during the trial Provision of assent/informed consent form signed by the subject and by the parent(s) or another legally acceptable representative Exclusion Criteria: children < 6 months or > 5 years G6PD deficiency (qualitative screen) in sites where P. vivax or P. ovale known prevalence rates represent major burden and whose treatment with primaquine is implemented within national guidelines Severe anemia Febrile illness (temperature ≥38.0°C) or moderate or severe acute illness/infection on the day of inclusion Sleeps in cluster <90% of nights during any given month Plans for extended travel (>1month) outside of home during study Participating or planned participation in another clinical trial investigating a vaccine, drug, medical device, or a medical procedure during the trial No provision of assent/informed consent form signed by the subject and by the parent(s) or another legally acceptable representative

Ages Eligible for Study
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Minimum Age: 6 Months
Maximum Age: 59 Months

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Placebo Comparator: Placebo<br>Placebo Repellent product with no active ingredient | Device: Spatial Repellent product without active ingredient (SHIELD)<br>* Spatial Repellent Product - Passive Emanator. The name of the product is SHIELD from SCJohnson<br>* Other names: Placebo SHIELD;|
| Active Comparator: Intervention<br>Spatial Repellent product with active ingredient | Device: Spatial Repellent product with active ingredient<br>* Spatial Repellent Product - Passive Emanator. The name of the product is SHIELD from SCJohnson<br>* Other names: SHIELD;Device: Active ingredient<br>* Transfluthrin (Active ingredient)<br>* Other names: Transfluthrin;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Malaria Incidence | Incidence of malaria infections among human cohorts during the follow-up period as detected by PCR | 104 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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malaria, Spatial Repellents, Plasmodium