In 1955, epidemiologist Thomas Francis Jr. announced the results of a field trial of the polio vaccine that Jonas Salk had developPosted on Thursday, May 27, 2021 11:12 PM‘The Last Time a Vaccine Saved America’TagsVaccinePolioHistoryRelated Links2025-04Lemmings, or how clever tricks make platforms more different than they seem2025-04Apple’s Darwin OS and XNU Kernel Deep Dive2025-02FDA cancels meeting to update next season's flu vaccines2024-12What Did Ada Lovelace's Program Actually Do?2024-12TimeMap.org - World History Atlas