A: a vaccine-derived poliovirus (VDPV) is a rare strain of poliovirus, genetically mutated from the strain contained in oral polio vaccine (OPV).
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。
In very rare instances, the virus in the vaccine can mutate into a form that can paralyse - this is what is known as a vaccine-derived poliovirus or VDPV.
在极少情况下，疫苗中的病毒可能变异成一种可导致瘫痪的类型，这就是人们所称的疫苗衍生脊髓灰质炎病毒(VDPV)。
In very rare instances, the virus in the vaccine can mutate into a form that can paralyse - this is what is known as a vaccine-derived poliovirus or VDPV.
在极少情况下，疫苗中的病毒可能变异成一种可导致瘫痪的类型，这就是人们所称的疫苗衍生脊髓灰质炎病毒(VDPV)。
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