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).
由于看到了输入脊髓灰质炎病毒以及发生疫情的风险，乌兹别克斯坦已经开展了4次全国性口服脊髓灰质炎疫苗活动，最后一次活动发生在10月25日至31日。
Recognizing the risk of a poliovirus importation and outbreak, Uzbekistan has conducted 4 nationwide OPV campaigns, the last one from 25-31 October.
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