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anti-vaccine movement

After widespread pressure to repudiate anti-vaccine misinformation on the social media platform, Facebook announced on Thursday that it's taking several steps to tackle the issue. Richard Drew/AP hide caption

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Richard Drew/AP

A measles outbreak in Washington state has triggered a state of emergency. In Clark County, where 35 cases have been reported, 31 were not immunized. Courtney Perry for The Washington Post/Getty Images hide caption

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Courtney Perry for The Washington Post/Getty Images

This did not really happen. Cows' heads did not emerge from the bodies of people newly inoculated against smallpox. But fear of the vaccine was so widespread that it prompted British satirist James Gillray to create this spoof in 1802. Institute of the History of Medicine, Johns Hopkins University hide caption

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Institute of the History of Medicine, Johns Hopkins University