Social media platforms are struggling to contain a new round of coronavirus conspiracy theories thanks, in part, to Donald Trump.

On Monday night, the president retweeted multiple accounts that posted a video falsely claiming that hydroxychloroquine cured Covid-19, including one tweet from his son, Donald Trump Jr. Many of those tweets were later removed, and Twitter suspended several of the users behind them, including Trump’s son, for 12 hours. But the video itself has continued to spread across social media platforms, raising fresh questions about how companies like Facebook and Twitter handle misinformation.

The video in question, which Trump Jr. called a “must watch,” features Houston doctor Stella Immanuel, who claimed that a combination of hydroxychloroquine, zinc, and the antibiotic Zithromax was a “cure” for the coronavirus and that “you don’t need to wear a mask.” The Food and Drug Administration (FDA) has said that hydroxychloroquine is “unlikely to produce an antiviral effect,” and the Centers for Disease Control and Prevention (CDC) recommends wearing masks to stop the spread of the virus. The video of Immanuel quickly went viral, drawing millions of views on Facebook, Twitter, and YouTube in a matter of hours.

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