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WORLDKINGS - Old Events - April 12, 2018 - Polio vaccine tested by Dr Jonas Salk announced to be 'safe and effective in 1955

11-04-2018

(Worldkings.org) Polio vaccines are vaccines used to prevent poliomyelitis (polio). There are two types: one that uses inactivated poliovirus and is given by injection (IPV), and one that uses weakened poliovirus and is given by mouth (OPV).

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