title: [Analysis of hemagglutination inhibition antibody level in patients with influenza A H1N1].
abstract: OBJECTIVE
  To understand the hemagglutination inhibition antibody level in patients with influenza A H1N1.
  
  
  METHODS
  Sera from 28 patients with influenza A H1N1 at different time points after illness onset were collected and measured by hemagglutination inhibition assay.
  
  
  RESULTS
  The serum hemagglutination inhibition antibody titers at 1, 5, 15, 22, 37, 49 and 58 days after illness onset were 5.36, 9.39, 39.02, 57.99, 137.92, 55.19 and 57.99 respectively. The top geometric mean titer of hemagglutination inhibition antibody was 148.55. The antibody seroconversion rate and seroprotection rate were occurred in 96.4% (27/28) of patients.
  
  
  CONCLUSIONS
  The patients with influenza A H1N1 have effective immune response.
authors.affiliation: Beijing 302 Hospital, Beijing 100039, China.
authors.forename: Hong-Hui
authors.initials: HH
authors.lastname: Shen
authors.forename: Jun
authors.initials: J
authors.lastname: Hou
authors.forename: Min
authors.initials: M
authors.lastname: Zhao
authors.forename: Jun
authors.initials: J
authors.lastname: Xu
authors.forename: Bing-Ke
authors.initials: BK
authors.lastname: Bai
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Hu
authors.forename: Pan-Yong
authors.initials: PY
authors.lastname: Mao
authors.forename: Bo-An
authors.initials: BA
authors.lastname: Li
authors.forename: Yuan-Li
authors.initials: YL
authors.lastname: Mao
mesh_terms: D000293:Adolescent; D000328:Adult; D000914:Antibodies, Viral / Q000097:blood / Q000276:immunology*; D002681:China; D005260:Female; D006385:Hemagglutination Inhibition Tests; D019267:Hemagglutinin Glycoproteins, Influenza Virus / Q000276:immunology*; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology* / Q000302:isolation & purification; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000276:immunology; D007251:Influenza, Human / Q000097:blood / Q000276:immunology* / Q000517:prevention & control / Q000821:virology; D008297:Male; D055815:Young Adult
chemical_list: D000914:Antibodies, Viral; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D007252:Influenza Vaccines