Since the type 2 wild polio hasn't been reported anywhere since 1999, all OPV-using countries switched to the bivalent oral polio vaccine, which doesn't include the type 2 component, in April 2016.
It is polio, a highly contagious viral disease that attacks the nervous system, often causing partial or full paralysis.
Children given inactivated polio vaccine (IPV) at least 6 months after the oral poliovirus vaccine (OPV) series develop better immunity, according to a report published online July 11 in the Lancet.
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