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In the Sabin vaccine, or the oral polio vaccine, now you have a non-virulent virus.
在沙宾疫苗,即口服小儿麻痹症疫苗中,存在非致病性病毒
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In the Sabin vaccine, or the oral polio vaccine, now you have a non-virulent virus.
在沙宾疫苗,即口服小儿麻痹症疫苗中,存在非致病性病毒
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