Abstract:
An acute flaccid paralysis(AFP) cases occurred on day 21 after the 3rd dose of oral polio vaccine (OPV) immunization in Nanxun district of Huzhou, Zhejiang province. This was the first case of vaccine associated paralytic poliomyelitis (VAPP) in Nanxun, the case's left lower extremity was involved. No significant contradictions, including perianal abscess, were found in the health examination before immunization. VAPP might occur after any dose of OPV except the first dose. This case was underreported. It is necessary to further improve and standardize the diagnostic criteria and procedures, further strengthen the surveillance of AFP to avoid the underreporting of such cases.