答：疫苗衍生脊髓灰质炎病毒(VDPV)是一种罕见的脊髓灰质炎病毒株，由口服脊髓灰质炎疫苗(opv)里的病毒株遗传变异而来。
A: a vaccine-derived poliovirus (VDPV) is a rare strain of poliovirus, genetically mutated from the strain contained in oral polio vaccine (OPV).
2009年，塔吉克斯坦报告了35例急性弛缓性麻痹病例，其中没有任何一例是由野生脊髓灰质炎病毒造成的。
In 2009, Tajikistan reported 35 cases of acute flaccid paralysis, of which none were caused by wild poliovirus.
2009年，塔吉克斯坦报告了35例急性弛缓性麻痹病例，其中没有任何一例是由野生脊髓灰质炎病毒造成的。
In 2009, Tajikistan reported 35 cases of acute flaccid paralysis, of which none were caused by wild poliovirus.
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