A MOMENT IN HISTORY
The Salk polio vaccine is declared safe and effective
1955 CE · United States, North America · Science
Polio vaccine is a vaccine used to prevent poliomyelitis (polio). Two types are used: an inactivated poliovirus given by injection (IPV) and a weakened poliovirus given by mouth (OPV). The World Health Organization (WHO) recommends all children be fully vaccinated against polio.
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