7Nicholson KG Kent J,Ireland DC.Respiratory Viruses and exaccrbations of asthma in adults[J].BMJ,1993,307(6910):982-986.
8Gem JE.Viral and bacterial infection in the development and progession of asthma[J].J Allergy Cli immumol,2000,105(suppl):479-482.
9Freymuth F,Vabret A,Brouard J,et al.Detection of Viral,Chlamydia pneumonia and Mycoplasma infection in exacerbation of asthma in children[J].J Clin Virol,1999,13(3)131-139.