PRevention of COVID-19 With Oral Vitamin D Supplemental Therapy in Essential healthCare Teams

Study Overview
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Brief Summary
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In this 16-week randomized control study, health care workers will receive a bolus dose followed by a weekly dose of vitamin D or a placebo bolus and weekly dose. This study will test whether high-dose of vitamin D supplementation decreases the incidence of laboratory-confirmed COVID19 infection (primary outcome), reduces illness severity, duration, as well as work absenteeism among health care workers (HCW) in setting at high-risk of contact with COVID-19 cases in high COVID-19 incidence areas.

Detailed Description
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Design. A 16-week triple-blind, placebo-controlled parallel-group, randomised trial of high-dose vitamin D supplementation compared to placebo in health care workers (HCW). Subjects: HCW caring for individuals at high-risk of infection (i.e., COVID-suspected or confirmed cases) will be randomly allocated in a 1:1 ratio in variable block size to: Intervention-1 oral loading dose of 100,000 IU vitamin D3 + 10000 IU weekly vitamin D3 or Control-identical placebo loading dose + daily placebo. Follow-up: 2 (randomisation and end-of-study) virtual or in-person visits with weekly reminders, brief health and work-status questionnaire. Randomisation/allocation concealment: Randomisation will be implemented using a computer-generated random list stratified by regions; health care workers will be allocated (1:1) using permuted block randomisation to enhance concealment. Sample size: A total of 2414 healthcare workers will provide 80% power to detect a 20% reduction in the risk of laboratory-confirmed COVID-19 infection. Given uncertainties in the infection progression, a Bayesian adaptive design is used where the posterior probability of effectiveness is the basis of inference and decision making, for study continuation or termination. Procedures. Use of remote or in-person randomisation and/or end-of-study visits and remote documentation of outcomes via electronic communication, mailing of biological samples, and external databases will facilitate enrolment, monitoring, and retention of motivated HCW in this high-intensity trial. Data analyses: An intention-to-treat analysis will be carried out on all randomized participants. Efficacy and safety analyses will be performed under allocation concealment with unblinding occurring after trial completion and analysis of primary outcomes.

Official Title
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PROTECT RCT (PRevention of COVID-19 With Oral Vitamin D Supplemental Therapy in Essential healthCare Teams

Conditions
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COVID-19

Intervention / Treatment
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* Dietary Supplement: Placebo
* Dietary Supplement: Vitamin D


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: are aged ≥18 and <70 years old; licenced to practice in Quebec; working or scheduled to work over the next 16 weeks in a setting at high-risk of contact with COVID-19 infected individuals, particularly (but not only) those involved with aerosol generating medical procedures in hospitals and/or caring for patients in long-term care facilities; working in high COVID incidence areas; covered by the RAMQ for medical services and hospitalisations; has a personal email or phone (to which to send every two weeks a reminder and questionnaire by email or text messages); has a fixed address (to which to send the material) in the greater Montreal or surrounding areas. Exclusion Criteria: vitamin D supplementation >400 IU/day or >12,000 IU/month in past 3 months; intention to take >400 IU per day during the study period; suspected or previously documented COVID-19 infection; history of nephrolithiasis, hypercalcemia, hyperphosphatemia, hyperparathyroidism, granulomatosis disease (e.g., tuberculosis, sarcoidosis), renal impairment/failure, or active cancer; use of any of the following medications: lithium, teriparatide, or digoxin; anticipated prolonged absence from work during the study period (i.e., pregnancy); enrolment in a concurrent randomized trial; has received a vaccine against COVID-19.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 69 Years

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
Interventional Model Description: Parallel-group, placebo controlled trial of vitamin D3 supplementation
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Placebo Comparator: Placebo<br>10 placebo tablets taken orally at baseline, followed by 1 placebo tablet once a week for 16 weeks Note that the study may be prolonged according to the overall infection rate monitored monthly. | Dietary Supplement: Placebo<br>* Weekly oral dose of placebo<br>|
| Experimental: Vitamin D3<br>10 tablets containing 10,000 IU (total : 100,000 IU) of Vitamin D3 taken orally at baseline, followed by 10,000 IU once a week for 16 weeks. Note that the study may be prolonged according to the overall infection rate monitored monthly. | Dietary Supplement: Vitamin D<br>* Weekly oral dose of Vitamin D<br>* Other names: cholecalciferol;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in incidence of laboratory-confirmed COVID-19 infection | documented by salivary or NP samples obtained clinically for screening or diagnostic purposes throughout the study period, self-obtained salivary samples at endpoint, analysed by RT-qPCR or COVID-19 seroconversion at endpoints | 16 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Distribution of disease severity | 5-category ordinal variable [asymptomatic, mild (managed at home); moderate (hospitalisation without supplemental oxygen; severe (oxygen supplementation); critical (mechanical ventilation/death) | up to 16 weeks | 
| Duration of symptoms in COVID-19 positive participants | For asymptomatic positive COVID-19 participants, symptoms will be recorded in a daily diary up to 14 days. Symptomatic positive COVID-19 participants will record their symptoms in a daily diary up to 48 hours after the resolution of symptoms | up to 16 weeks | 
| Number of participants with COVID-19 positive IgG serology | SARS-CoV-2 IgG Diasorin on Liaison XL platform | 16 weeks | 
| Number of workday absences due to COVID-19 suspected/confirmed infection | Participant-reported; reported by Direction of Human Resource (or for physicians, Direction des services professionnelles) databases | 16 weeks | 
| Number of workday absences for any reason | Participant-reported; reported by Direction of Human Resource (or for physicians, Direction des services professionnelles) databases | 16 weeks | 
| Adverse health events | Number and distribution of adverse health events | 16 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Vitamin D, Primary prevention, Health care workers