哮喘是呼吸道的慢性变态反应性炎症病变,它与遗传因素和环境因素有关。近年来越来越多的观察表明,在哮喘的形成和反复发作中,呼吸道感染因素起了很大的作用。 一、呼吸道病毒感染 (一)流行病学:急性病毒性呼吸道感染是人类最常见的疾病,尤其是婴幼儿和儿童。通常引起上呼吸道感染的病毒, Asthma is a chronic allergic inflammation of the respiratory tract, which is related to genetic and environmental factors. In recent years, more and more observations show that respiratory infection plays an important role in the formation and recurrent asthma attacks. First, respiratory virus infection (A) Epidemiology: Acute viral respiratory tract infection is the most common human diseases, especially infants and children. The virus that usually causes upper respiratory tract infections,