2Johnston SL, Pattenmore PK, Sanderson G, et al. The ralationship between upper respiratory infections and hospital admissions for asthma: a time trend anylysis. Am J Respir Crit Care Med, 1996,154 : 654-660.
3West JA, Dakhama A, Khan MA, et al. Communtity study using a polymerase chain reaction panel to determine the prevalence of common respiratory viruses in asthmatic and nonasthmatic children .J Asthma, 1999, 36: 605-612.
4Hahn DL, Dodge RW, Golubjatnikov R. Association of C.Pneumonia (strain TWAR ) infection with wheezing, asthmatic bronchitis and adult-onset asthma. ,JAMA, 1991, 266:255-230.
5Cunningham AF, Johoston SL, Julious SA, et al. Chronic chlamydia pneumoniae infection and excerbations in children. Eur Respir J,1998, 11 : 345-349.
6Kraft M, Cassell GH, Henson JE, et al. Detection of mycoplasma pneumoniae in the airway of adults with chronic asthma, Am J Respir Crit Care Med, 1998, 158: 998-1001.