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。
The need for additional rounds of mass oral polio vaccine (OPV) immunization will be based on an ongoing evaluation of epidemiological and laboratory data.
是否有必要进行更多轮次的口服脊髓灰质炎疫苗大规模免疫接种活动，将以正在进行的流行病学和实验室数据评估情况作为根据。
In the meantime, more than 33 000 children were paralysed by wild poliovirus while more than 6.5 million polio cases were prevented by the oral polio vaccine.
这期间，虽然口服脊髓灰质炎疫苗防止了超过650万起脊髓灰质炎病例的发生，但仍有33,000余名儿童因感染脊髓灰质炎野病毒株致瘫。
In the past 10 years worldwide (as of September 2007), more than 10 billion doses of oral polio vaccine have been administered to more than 2 billion children.
过去十年在全球范围内(截至2007年9月)，共有超过100亿份口服脊髓灰质炎疫苗用于20多亿儿童。
GACVS was informed of the programme's decision to stop oral polio vaccine use after certification of eradication in light of the adverse effects associated with its long-term use.
GACVS获悉，鉴于长期使用口服脊髓灰质炎疫苗可伴有不良反应，消灭脊髓灰质炎规划已经决定，在证实消灭脊髓灰质炎之后，停止使用该口服疫苗。
The solution is the same for all polio outbreaks: immunize every child several times with the oral vaccine to stop polio transmission, regardless of the origin of the virus.
同样的解决办法可用来应对所有脊髓灰质炎暴发：给每个儿童采用多次口服疫苗方式进行免疫，以阻止脊髓灰质炎的传播，而无须考虑传染源如何。
The solution is the same for all polio outbreaks: immunize every child several times with the oral vaccine to stop polio transmission, regardless of the origin of the virus.
同样的解决办法可用来应对所有脊髓灰质炎暴发：给每个儿童采用多次口服疫苗方式进行免疫，以阻止脊髓灰质炎的传播，而无须考虑传染源如何。
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