title: [Lower respiratory tract infection caused by influenza virus A and influenza virus B in Wenzhou, China: a clinical analysis of 366 children].
abstract: OBJECTIVE
  To compare the epidemiological and clinical features of lower respiratory tract infection (LRTI) caused by influenza virus A (IVA) and influenza virus B (IVB) in children.
  
  
  METHODS
  The clinical data of 366 children with LRTI caused by influenza virus (IV), who were hospitalized in Yuying Children&prime;s Hospital of Wenzhou Medical University between 2010 and 2014, were analyzed retrospectively, and there were 272 cases caused by IVA and 94 cases caused by IVB.
  
  
  RESULTS
  IV was mainly prevalent from December to March of the next year, with the predominance of IVA. There were small peaks of IVA prevalence in July or September every other year, and IVB was prevalent from December to March of the next year every other year. The children with LRTI caused by IVA alone had a significantly higher white blood cell (WBC) count and significantly higher percentages of children with increased WBC, abnormal serum sodium, and abnormal serum potassium than those caused by IVB alone (P<0.05). However, there were no significant differences in age, sex, underlying diseases, clinical manifestations, and co-infection rate with bacteria or atypical pathogens between the two groups (P>0.05). The rate of co-infection with respiratory syncytial virus (RSV) was significantly higher in the IVB group than in the IVA group (P<0.01).
  
  
  CONCLUSIONS
  IVA is prevalent in winter and spring every year and has small peaks in summer every other year, while IVB is prevalent in winter and spring every other year. Compared with IVB, IVA causes more cases of increased WBC and electrolyte disturbance. The children infected with IVB are more likely to be co-infected with RSV. The children with LRTI caused by IVA and IVB have similar clinical manifestations.
authors.affiliation: Department of Respiratory Disease, Yuying Children&prime;s Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, China. wzlichch@21cn.com.
authors.forename: Pei-Pei
authors.initials: PP
authors.lastname: Zhong
authors.forename: Hai-Lin
authors.initials: HL
authors.lastname: Zhang
authors.forename: Xiao-Fang
authors.initials: XF
authors.lastname: Chen
authors.forename: Ya-Feng
authors.initials: YF
authors.lastname: Liang
authors.forename: Li
authors.initials: L
authors.lastname: Lin
authors.forename: Shao-Yan
authors.initials: SY
authors.lastname: Yang
authors.forename: Jiang-Yin
authors.initials: JY
authors.lastname: Sheng
authors.forename: Chang-Chong
authors.initials: CC
authors.lastname: Li
mesh_terms: D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009980:Influenza A virus / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D009981:Influenza B virus / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D007251:Influenza, Human / Q000175:diagnosis / Q000453:epidemiology / Q000821:virology*; D008297:Male; D012141:Respiratory Tract Infections / Q000175:diagnosis / Q000453:epidemiology / Q000821:virology*; D012189:Retrospective Studies; D012621:Seasons