We are looking at whether hydroxychloroquine prophylaxis can protect healthcare workers from catching COVID-19. Participants will take hydroxychloroquine or placebo tablets for three months and will need to attend monthly visits at their local participating hospital for a maximum of five months

Participants must have a smartphone.

Do you work in a GP surgery, dental surgery or opticians and are interested in taking part?

If so, register your interest through the study website www.copcov.org, and your local study team will be in touch.