4Sigurs N,Bjarnason R, Sigurbergsson F, et al. Respiratory syncytial virus bronchiolitis in infancy is an important risk factor for asthma and allergy at age 7 [J]. Am J Respir Crit Care Med, 2000, 161 (5) : 1501 - 1507.
5Piedimonte G. Origins of reactive airways disease in early life: do viral infections play a role? [J]. Acta Paediatr Suppl,2002,91 (437) :6-11.
6Gleason PP. The emerging role of atypical pathogens in community-acquired pneumonia [J]. Pharmacotherapy, 2002,22(1 Pt 2) :2S-11S.