Malaria drug fails to prevent COVID-19 in a rigorous study

Researchers say that a malaria drug President Donald Trump took to try to prevent COVID-19 proved ineffective for that in the first large, high-quality study to test it in health workers and others closely exposed to people with the disease.

Results published Wednesday by the New England Journal of Medicine show that hydroxychloroquine was no better than placebo pills at preventing illness from the coronavirus.

The study involved 821 people in the U.S. or Canada who took the drug or placebo pills for five days.

Two weeks later, illness rates were similar in both groups.

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