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並前往https://www.who.int/immunization/diseases/poliomyelitis/endgame_objective2/oral_polio_vaccine/VAPPandcVDPVFactSheet-Feb2015.pdf

Vaccine-associated paralytic polio (VAPP) and vaccine ...

Vaccine-associated paralytic polio (VAPP) and vaccine-derived poliovirus (VDPV). The oral polio vaccine (OPV) is an extremely safe and effective tool for ...

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