Masks worn during experiments with plague. Manila, Philippines (1912). Original image from National Museum of Health and… https://www.rawpixel.com/image/2298618/free-photo-image-vintage-covid-peopleFree Image from public domain licenseThe American Soldiers in Presence of Gas during World War I (1918). Original image from National Museum of Health and… https://www.rawpixel.com/image/2298627/free-photo-image-vintage-people-covidFree Image from public domain licenseSocial issues during the coronavirus crisis doodle element set vector https://www.rawpixel.com/image/2311531/free-illustration-vector-covid-doodleView licenseWomen wearing surgical masks during the influenza epidemic, Brisbane (1919). 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