毛细支气管炎(以下简称毛支炎)好发于要幼儿,尤其是6个月内的幼婴。其病原主要是呼吸道合胞病毒(RSV)。临床表现与支气管哮喘(简称哮喘)相似。毛支炎与哮喘的关系至今未明。有人追踪研究毛支炎的263例婴儿,有25～32％在其儿童后期发展为哮喘,其中44～69％患儿的家庭有过敏性疾病史。过敏性小儿易患呼吸道病毒感染,病毒感染后易诱发哮喘。某些病毒感染(如RSV和副流感病毒的呼吸道感染)与哮喘有特别密切关系。RSV感染的毛支炎婴儿,半数以上在2～7岁内有反复发作的哮喘,并证明其初次感染后,其气 Bronchiolitis (hereinafter referred to as gross bronchitis) occurs in young children, especially within 6 months of infants. Its pathogen is mainly respiratory syncytial virus (RSV). Clinical manifestations and bronchial asthma (asthma) similar. The relationship between bronchiolitis and asthma is still unknown. Some of the 263 infants reported to have had hair follicles, 25 to 32% developed asthma later in their child’s life, and 44 to 69% of the children had a history of allergic diseases. Allergic children susceptible to respiratory virus infection, easy to induce asthma after virus infection. Some viral infections (such as respiratory infections of RSV and parainfluenza virus) are particularly relevant to asthma. RSV infection in hairy baby infants, more than half of 2 to 7 years of recurrent asthma, and proved its initial infection, the gas