What a big Covid-19 study on malaria drugs tells us — and what it doesn’t

What a big Covid-19 study on malaria drugs tells us — and what it doesn’t

What a big new study on malaria drugs as Covid-19 treatments tells us — and what it doesn’t

By MATTHEW HERPER

GEORGE FREY/AFP VIA GETTY IMAGES

The study underlines safety concerns and heightens questions on whether or not the drugs are effective at all. But there's a lot we can't conclude from it.

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