Randomized trial shows hydroxychloroquine doesn’t prevent Covid-19 as questions arise about earlier study

Randomized trial shows hydroxychloroquine doesn’t prevent Covid-19 as questions arise about earlier study

A randomized, placebo-controlled trial published in NEJM found the malaria drug was not effective as a post-exposure prophylaxis against coronavirus disease. However, questions have arisen about data used in a large observational study about the drug published last month.

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