2. Ongoing trials for prevention: actively recruiting or completed; not yet published.

Trial registration number; trial registry	Location(s)	Interventions; population; abbreviated name	Recruitment status	Estimated completion	Target enrolment
NCT04333732 ClinicalTrials.gov	USA	Low‐/medium‐/high‐dose chloroquine vs placebo Healthcare workers	Recruiting	February 2021	55,000
NCT04303507 ClinicalTrials.gov	Europe, Asia, Africa	HQC vs CQ vs placebo Healthcare workers COPCOV	Recruiting	April 2021	40,000
NCT04334928 ClinicalTrials.gov	Spain	Emtricitabine/tenofovir (Truvada) vs HCQ vs Truvada + HCQ vs placebo Healthcare workers EPICOS	Recruiting	June 2020	4000
NCT04334148 ClinicalTrials.gov	USA	HCQ vs placebo Healthcare workers	Recruiting	July 2020	15,000
NCT04363450 ClinicalTrials.gov	USA	HCQ vs placebo Healthcare workers (pre‐exposure) HCQPreP	Recruiting	July 2020	1700
NCT04318444 ClinicalTrials.gov	USA	HCQ vs placebo Household contacts (postexposure)	Recruiting	March 2021	1600
NCT04341441 ClinicalTrials.gov	USA	Daily HCQ vs weekly HCQ vs placebo Healthcare workers and first responders	Recruiting	June 2020	3000
IRCT20190122042450N4 Iranian Clinical Trials Registry	Iran	HCQ vs no HCQ All contacts (postexposure)	Completed	Not reported	1000
ISRCTN14326006 ISRCTN registry	Canada	HCQ vs placebo Healthcare workers	Recruiting	January 2022	988
NCT04363827 ClinicalTrials.gov	Italy	HCQ vs no HCQ All contacts	Recruiting	September 2020	2300
NCT04352933 ClinicalTrials.gov	UK	HCQ weekly vs HCQ daily vs placebo Healthcare workers	Recruiting	October 2020	1000
NCT04353037 ClinicalTrials.gov	USA	HCQ vs placebo Healthcare workers	Recruiting	April 2021	850
ACTRN12620000501943 ANZCTR	Australia	HCQ vs placebo Healthcare workers	Recruiting	December 2020	2250
NCT04374942 ClinicalTrials.gov	USA	HCQ vs placebo Healthcare workers	Recruiting	January 2022	988
EudraCT 2020‐001987‐28 EudraCT	Italy	HCQ vs no HCQ Healthcare workers	Recruiting	Not reported	1000

CQ, chloroquine; HCQ, hydroxychloroquine