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Polio Vaccine: Anniversary, 1955
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April 12th, 2025 This day in April marks the anniversary of announcement that the polio vaccine developed by American physician Dr. Jonas E. Salk was "safe", potent and effective". Incidence of infantile paralysis or poliomyelitis, declined by 95% following introduction of preventive vaccines. The first mass inoculations of children with the Salk vaccine had begun in Pittsburgh in 1954. Source: www.historyofvaccines.org/content/articles/history-polio-poliomyelitis 
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Additional April Events
National Walking Day April 7th, 2025 
US Mint: Anniversary, 1792 April 2nd, 2025 |
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