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Polio Vaccine: Anniversary, 1955
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April 12th, 2021 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 began in Pittsburgh in 1954. Source: www.historyofvaccines.org/content/articles/history-polio-poliomyelitis 
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Additional April Events
Barbershop Quartet Day April 11th, 2021 
Birthday Anniversary: William Hearst April 29th, 2021 
Library Snapshot Day April 1st, 2021 |
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