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The COPCOV study will enroll 40,000+ frontline health care workers and staff who have close contact with COVID-19 patients to see if chloroquine or hydroxychloroquine are effective in preventing or reducing the severity of COVID-19 infections. Any adult who works in a healthcare facility who has not been diagnosed with COVID-19 or an Acute Respiratory Illness (ARI) can participate by enrolling at one of our COPCOV study sites in Europe, Asia and Africa. This video explains what happens when you enrol in COPCOV.