Recently, researchers studied 821 adults in the U.S. and Canada who had been exposed to someone with COVID-19 but who still did not have any symptoms. Within four days of exposure, the participants were divided into two groups. One group received the drug, hydroxychloroquine, while the other group received an inactive drug (known as a placebo) for five days. Over the next 14 days, 13% of participants got COVID-19, regardless of which treatment they received; however, side effects were more than twice as common with hydroxychloroquine than with placebo. The researchers concluded that hydroxychloroquine did not prevent COVID-19 infection. The study had several limitations. For example, testing was mostly unavailable, so they could not confirm most cases of the virus and had to rely on symptoms for suspected COVID-19. Also, participants were generally younger and healthier than those at risk for severe COVID-19. More studies are coming.


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