title: [Survey research of serum anti-influenza virus antibody levels in Chinese young people during 1997-2000].
abstract: OBJECTIVE
  To survery the levels of serum anti-influenza virus antibodies and variable extent of the virus in the young people.
  
  
  METHODS
  The levels of anti-influenza virus antibody in the serum samples collected from 3 000 young people of eight different areas in China in spring and autumn per year during 1997-2000 were detected by microhemagglutination inhibition test.
  
  
  RESULTS
  The antibody levels of the young people fluctuated between the spring and autumn per year. The levels of antibody against type A3 virus (H3N2) preserved high from 1999-2000, while the level of antibody to type A1 (H1N1) decreased from 1998 to 2000 and the percentages of people susceptible to this type rose from 15% to 75%.
  
  
  CONCLUSIONS
  The epidemic of H3N2, H1N1 viruses and influenza virus type has occurred at some areas in China. Significant variation appeared in H1N1 virus, while the variation of H3N2 virus will be expected.
authors.affiliation: Center of Laboratory, The General Hospital of Second Artillery, Beijing 100088,China.
authors.forename: Pei-Ruo
authors.initials: PR
authors.lastname: Duan
authors.forename: Hua
authors.initials: H
authors.lastname: Zhao
authors.forename: Jing
authors.initials: J
authors.lastname: Lin
authors.forename: Yu
authors.initials: Y
authors.lastname: Du
mesh_terms: D000914:Antibodies, Viral / Q000097:blood; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology; D053122:Influenza A Virus, H3N2 Subtype / Q000276:immunology; D009980:Influenza A virus / Q000276:immunology; D007251:Influenza, Human / Q000821:virology; D011795:Surveys and Questionnaires
chemical_list: D000914:Antibodies, Viral