Conveniently, the microRNA that targets t antigen is made late in the infectious cycle, just when t antigen is no longer essential for virus replication.

以t抗原为攻击目标的小分子rna在感染周期的最后环节才会产生，而这时t抗原已经不再是病毒繁殖的必须条件。

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The only way to break that cycle is to vaccinate everyone of all ages, said Dr. James Cherry, professor of pediatric infectious diseases at the University of California, Los Angeles.

CNN: Vaccination role unclear in whooping cough outbreak