引起上呼吸道感染的主要病因是病毒,少数由细菌或肺炎支原体引起。轻症主要是流清水鼻涕、打喷嚏、稍咳、咽痛、疲乏、纳呆,可有低热,病程大约3～4 d,少数持续1周以上;重症患儿可伴高热、频咳、烦躁、少数可有高热惊厥。预后一般良好,但体 The main cause of upper respiratory tract infection is the virus, a small number caused by bacteria or Mycoplasma pneumoniae. Slightly the main flow of water runny nose, sneezing, a little cough, sore throat, fatigue, poor appetite, may have low fever, duration of about 3 ~ 4 d, a few continued for more than 1 week; severe children with fever, frequent cough, irritability Few may have febrile seizures. The prognosis is generally good, but the body