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A temperature check is conducted at a Trump campaign rally last month in Toledo, Ohio. Stephen Zenner/LightRocket via Getty Images hide caption

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Stephen Zenner/LightRocket via Getty Images

A school official shows a pupil an infrared digital laser thermometer before taking his temperature in Lagos, Nigeria, in September. Starting this week, similar hand-held devices are checking foreheads for fever at some U.S. airports. Akintunde Akinleye/Reuters/Landov hide caption

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Akintunde Akinleye/Reuters/Landov