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).

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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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