National Polio Immunization Program, 1960s
Young girl is receiving polio immunization injection at a mobile clinic. A person is considered to be fully immunized if he or she has received a primary series of at least three doses of inactivated poliovirus vaccine (IPV), live oral poliovirus (OPV), or any combination of IPV and OPV. n the early 1950's, there were more than 20,000 cases of polio each year. After polio vaccination began in 1955, cases dropped significantly. By 1960, the number of cases dropped to about 3,000, and by 1979 there were only about 10.
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