1、California is now in the middle of the worst outbreak of pertussis in half a century.
加州目前正處于半個世紀(jì)以來最嚴(yán)重的百日咳爆發(fā)中。

2、Fermental cultivation of Bordetella pertussis immunogens
百日咳桿菌有效免疫原的發(fā)酵培養(yǎng)

3、However, pertussis is still a relatively uncommon cause of chronic cough.
然而，百日咳還是相對不常見的慢性咳嗽的原因。

pertussis翻譯