Live vaccines, such as oral poliovirus vaccine; yellow fever vaccine; and measles, mumps and rubella vaccines, do not contain thiomersal, because it would kill the immunizing component.

一些活疫苗，比如口服脊髓灰质炎疫苗；黄热病疫苗；麻疹，腮腺炎和风疹疫苗并不含硫柳汞，因为后者会杀死免疫成分。

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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。

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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。

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