呼吸道感染是儿科最常见的疾病。其就诊率约占儿科门诊的 6 0 %～ 90 % ;占住院病人的 30 %～6 9 %。门诊患儿中绝大部分是上呼吸道感染 ,多侵犯鼻、咽、喉 ;也有 15 %～ 2 0 %患儿可侵犯下呼吸道。上、下呼吸道感染的病原有连续性。由于呼吸道感染是我国小儿首位的感染性疾病 Respiratory infections are the most common pediatric diseases. The visiting rate accounts for 60% to 90% of pediatric outpatient clinics, accounting for 30% to 69% of inpatients. Most outpatients with upper respiratory tract infection, more violations of the nose, throat, larynx; there are 15% to 20% of infants can infringe the lower respiratory tract. Upper and lower respiratory tract infection of the pathogen continuity. As respiratory tract infection is the first infectious disease in children in our country