Infections can occur in the upper or lower respiratory tract, and symptoms may vary depending on the type of infection.

感染可发生在上呼吸道或下呼吸道，症状可能因感染类型而异。

It's transmitted through the air, replicates in the lower respiratory tract, and is thought to last for days on countertops.

它能通过空气传播，在下呼吸道中自我复制，并被认为可以在一般桌面上存活数日。

This is associated with formation of lung abscesses due to aspiration of microbes from the oropharynx to the lower respiratory tract.

这与肺脓肿的形成有关，而肺脓肿是由于病原微生物从口咽吸入到下呼吸道所致。

Overall the efficacy rates were pretty impressive: GSK's vaccine was about 83 percent effective at preventing infection in the lower respiratory tract in adults 60 and older and 94 percent effective at preventing severe disease.

疫苗总体疗效非常可观：在预防 60 岁及以上成年人下呼吸道感染方面，葛兰素史克疫苗的有效率约为 83%，重症预防率为 94%。