...但该病毒导致瘫痪的比例为1/1000；而Ⅰ型病毒导致瘫痪的比例为1/200，而且该病毒同样具有隐伏性。三价口服脊髓灰质炎疫苗（OPV）是GPEI的主力，但该疫苗对一些血清型病毒的免疫能力却高于另一些血清型。
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口服抗脊髓灰质炎疫苗 oral anti-poliomyelitis vaccine
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。
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.
从巴基斯坦出发的旅客应在离开巴基斯坦前完成免疫接种的完整疗程，出发前至少要服用一剂口服脊髓灰质炎疫苗。
Travellers from Pakistan should have a full course of vaccination against polio before leaving Pakistan, with a minimum one dose of OPV before departure.
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。
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.
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