3 June 2020 - The first carefully controlled trial of hydroxychloroquine given to people exposed to the coronavirus did not show any benefit.
The malaria drug hydroxychloroquine did not prevent COVID-19 in a rigorous study of 821 people who had been exposed to patients infected with the virus, researchers from the University of Minnesota and Canada are reporting on Wednesday.
The study was the first large controlled clinical trial of hydroxychloroquine, a drug that President Trump has repeatedly promoted and recently taken himself. Conducted in the United States and Canada, this trial was also the first to test whether the drug could prevent illness in people who have been exposed to the coronavirus.