干咳指不从呼吸道排出痰液的咳嗽。
One feature seen in many patients is the development of lower respiratory tract early in the illness.在许多患者身上观察到的一项特征是,疾病初期会出现下呼吸道症状。
The H5N1 virus tends to infect the lower respiratory tract in humans, where it can easily get out and spread.而H5N1病毒倾向于感染人的下呼吸道,从这里病毒很难传播出去感染其他人。