By contrast, the entry molecules preferred by influenza viruses are almost exclusive to the upper respiratory tract.

相比之下，流感病毒首选的进入分子几乎只存在于上呼吸道。

They breathed into a sealed box packed with sensitive instruments, and worked out humidity levels in their upper respiratory tracts.

他们向一个密封的盒子里呼气，盒子里装满了敏感的仪器，然后计算出他们上呼吸道的湿度。

Acute laryngitis is most common and it's usually due to an upper respiratory tract infection, most often due to a virus.

急性喉炎是最常见的，通常由于上呼吸道感染，最常见病因为病毒感染。

Infections are usually mild with upper respiratory tract infection and acute bronchitis common, but it can cause pneumonia in approximately 5-10% of cases.

感染通常较轻，常见上呼吸道感染和急性支气管炎，但在大约 5-10% 的病例中可引起肺炎。

Second, it's airborne and infects the upper respiratory tract, which means it's readily spewed back into the air where it can drift from person to person.

其次，它通过空气传播感染上呼吸道，这表示它很容易再被喷回到空气中，在人与人之间漂移。

It mainly causes upper respiratory tract infections, and gets its rhino- name, meaning nose, because it commonly causes a runny nose, nasal congestion, and sneezing, as well as a sore throat and cough.

它主要引起上呼吸道感染，其中rhino-表示鼻子；它通常导致流鼻涕、鼻塞和打喷嚏，以及喉咙痛和咳嗽的症状。

And so the worst case in terms of spreading is somebody who's got a lot in the upper respiratory tract but almost none in their lungs, so they're not care-seeking.

因此，就传播而言，最糟糕的情况是上呼吸道有很多但肺部几乎没有，所以他们不会寻求护理。

Detection of 2019-nCoV RNA in specimens from the upper respiratory tract with low Ct values on day 4 and day 7 of illness is suggestive of high viral loads and potential for transmissibility.

在患病第 4 天和第 7 天， 在上呼吸道标本中检测到 2019-nCoV RNA 具有低 Ct 值， 这表明病毒载量高且具有传播潜力。