PARIS—Sporting long white hair, a shaggy beard and a skull ring on his right pinkie finger, a French doctor with a history of challenging the medical establishment has become a folk hero here by stoking the controversy over the use of an antimalarial drug to treat Covid-19.
Didier Raoult, a 68-year-old infectious-disease specialist, has emerged as a standard-bearer for those who support the use of the medicine, hydroxycholoroquine, to treat the growing number of people sickened by the new coronavirus, despite what health…

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