What Is the Oral Polio Vaccine (OPV)?

OPV oral polio vaccine
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What Is the Oral Polio Vaccine (OPV)?

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Oral polio vaccine (OPV) is a vaccine that contains live but weakened poliovirus. OPV is highly effective in polio prevention. However, because of the risk of a rare but serious condition called vaccine-associated paralytic poliomyelitis, OPV use in the United States was discontinued in 2000.