... virtuous deficit 有效能赤字... virulence attenuation of 毒力减弱... virulence test 毒力试验...
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attenuation of virulence 减毒作用
The virus was analyzed by the animal pathogenicity test, virus attenuation, protection of the attenuated virus and virulence return experiment.
对分离的痘病毒进行动物致病性试验、病毒分离传代和致弱试验、致弱毒保护力试验和返强试验。
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