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A global study examining the impact of chloroquine / hydroxychloroquine in preventing COVID-19, COPCOV has recruited 4,110 participants as of 1 Dec from sites in Benin, Côte d’Ivoire, Indonesia, Kenya, Mali, Nepal, Pakistan, Zambia, and closed sites in Thailand, Niger and the UK. COPCOV will end recruitment of new participants ~15 Dec 2021, with preliminary study results expected Q1 2022.