title: [The analysis of clinical character in different age patients suffered from A-H1N1].
abstract: OBJECTIVE
  To describe the feature of different age patients with A-H1N1.
  
  
  METHODS
  Cross-sectional study was performed in 95 patients who were confirmed to be infected with A-H1N1 from May, 2009 to July, 2009, in according to their age.
  
  
  RESULTS
  The average age of patients with A-H1N1 infection was 23.44 +/- 14.73. Accumulative prevalence in children and young adult reached 74.7% of total patients. There was a trend that the subclinical infection rate raised gradually from 0-15 years group to over 45 years group. The percent of lymphocyte in 0-15 years group was significantly higher than other age groups, P = 0.039. The average time of virus shedding were 6.5 +/- 2.10 days (from 2 days to 12 days) , and there were no significant difference in diverse age groups, P = 0.272. 13 out of 95 (13.7%) patients presented complications related with A-H1N1 infection, and 4 of 6 patients complicated with pneumonia were in the 0-15 years group.
  
  
  CONCLUSIONS
  The distribution of age in A-H1N1 infection is markedly different from seasonal influenza, with more cases in school children and young adults and fewer cases in older adults. Flu-like symptoms in children were apparent and pneumonia was the major complication in children.
authors.affiliation: Beijing Youan Hospital, Capital Medical University, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yong-hong
authors.initials: YH
authors.lastname: Zhang
authors.forename: Lian-chun
authors.initials: LC
authors.lastname: Liang
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.forename: Yue-ke
authors.initials: YK
authors.lastname: Zhu
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Xia
authors.initials: X
authors.lastname: Feng
authors.forename: Dong-mei
authors.initials: DM
authors.lastname: Ma
authors.forename: Yu-fen
authors.initials: YF
authors.lastname: Tan
authors.forename: Hao
authors.initials: H
authors.lastname: Wu
authors.forename: Hui-ping
authors.initials: HP
authors.lastname: Yan
mesh_terms: D000328:Adult; D000367:Age Factors; D058345:Asymptomatic Infections / Q000453:epidemiology*; D002648:Child; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification / Q000472:pathogenicity*; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology; D007251:Influenza, Human / Q000145:classification / Q000473:pathology; D015995:Prevalence
chemical_list: D007252:Influenza Vaccines