After realizing the goal of polio-free there shall be no circulation of indigenous wild poliovirus but still requires a high coverage rate of oral polio vaccine ( OPV ) OPV may induce virus associated paralytic poliomyelitis ( VAPP ) in few vaccinees and their contacts .

实现无 脊髓灰质炎（脊灰）目标后，已无本土脊灰野病毒的循环，但需维持口服脊灰疫苗（OPV）的高 免疫覆盖率。

Strains of poliovirus including 2 strains of type I 1 of type II and 2 of mixed virus ( I + III ) and 5 strains of non poliomyelitis enterovirus ( NPEV ) were obtained .

分离出脊灰病毒（PV）5株，其中Ⅰ型2株，Ⅱ型1株，混合 型（Ⅰ+Ⅲ）2株，非 脊 灰肠道病毒（NPEV）5株。

Analysis on the Result of the Virus Titer of Oral Live Poliomyelitis Vaccine Drage ′ e in Recently 5 Years

口服 脊髓灰质炎活疫苗糖丸的 病毒滴度及其分析

Methods We analyzed the epidemiological character of acute flaccid paralysis ( AFP ) cases with isolation of polio vaccine related virus strains and the occurrence of vaccine-associated paralytic poliomyelitis ( VAPP ) in the polio free phase in the past years .

方法分析无脊髓灰质炎阶段杭州市连续5年检出脊灰疫苗相关株 病毒的急性弛缓性麻痹（AFP）病例的流行病学特征，以及疫苗相关麻痹型 脊 灰（VAPP）的发生情况。