Disease starts as upper respiratory infection with hoarseness and croupy cough.

疾病始于上呼吸道感染，伴有声音嘶哑和干咳。

I mean, if someone who whenever they get an upper respiratory infection really dramatically exacerbates their asthma.

如果某人受到上呼吸道感染，确实会大大加剧他们的哮喘。

And about 10 to 30 percent of all the upper respiratory infections are caused by corona viruses.

大约10%到30%的上呼吸道感染是由冠状病毒引起的。

Three of the four had had a recent upper respiratory infection, and two had the Epstein-Barr virus.

四名孩子中有三名最近患有上呼吸道感染，两名携带 EB 病毒。

A runny nose can become a sign of a more serious infection such as sinusitis, an upper respiratory infection.

流鼻涕也可能是更严重的感染的迹象，如鼻窦炎，上呼吸道感染。