MOSCOW—Yelena Malysheva has been lecturing Russians on healthy lifestyles for 23 years. She presents, rather like Dr. Oz in the United States, a TV show that tries to make medicine entertaining and accessible, even if science takes second place to showmanship or, some would say, serious quackery. Like Dr. Oz, who has the ear of America’s president, Malysheva has the ear of Russia’s. And like Dr. Oz, she has never been more dangerous than right now in the midst of the COVID-19 pandemic.

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