5Mc Connochie KM,Hall CB,Walsh EE,et al.Variation in severity of respritory syncytial virus infections with subtype[J].J Pediatr,1990,117:(1 Pt 1):52-62.
6Neves B J,Fonseca C,Cardoso M,et al.Relationship between respiratory syncytial virus subtybe and clinical reverity in bronchiolitis[J].Ann Esp Pediatr,2001,54(6):559-566.
7Papadopoulos NG,Moustaki M,Tsolia M,et al.Association of rhinovirus infection with increased disease severity acute bronchiolitis strain[J].Am J Respir Critcare Med,2002,9:1285-1294.
8van den Hoogen BG,de Jong TC,Grou J,et al.A newly discovered human metapneumovirus isolation from young children with respirtory tract disease[J].Nat Med,2001,7:719-724.
9Mc Ckaym,Jacob KC,Woolhouse D,et al.Molecular assays for detection of human metapneumovirus[J].J Clin Microbiol,2003,41:100-105.
10Hederos CA,Janson S,Bornehag CG,et al.The burden of asthma as reflected by the prevalence defined by doctor's diagnosis and the use of healthcare services by preschool children in a Swedish region[J].Acta Pediatr,2002,91 (11):1246-1250.
