title: [Analysis of influenza type A(H1N1) antibody levels in different population in Gansu province].
abstract: OBJECTIVE
  To investigate influenza type A(H1N1) antibody levels in 3 different population which included common people, people recovered from be infected with influenza A(H1N1) and people vaccinated influenza type A(H1N1) vaccine in Gansu province in 2009.
  
  
  METHODS
  Hemagglutination Inhibition (HI) test, HI test is positive when HI-titer > or = 1:40.
  
  
  RESULTS
  The influenza type A(H1N1) antibody-positive rate of urban population were 3.64% (11/302) and 10.45% (44/421) in Gansu province in August and later November respectively. The antibody-positive rate of people vaccinated after 30 days was 46.13% (131/284), GMT was 1:21.31. 10-15 days after infected by influenza type A(H1N1), HI antibody-positive rate was 87.04%, it rose to 96.40% after 15 days vaccination, and GMT was 1:139.4.
  
  
  CONCLUSIONS
  In Gansu, Influenza A H1N1 outbroke firstly among students. Currently, all age groups were reported being infected with the influenza type A H1N1 virus. Only 6.65% of residents were given vaccination, antibody level of influenza type A H1N1 in people was low. Influenza type A(H1N1) virus will continue to spread in Gansu. Strengthening vaccination and improving treatment to serious cases were recommended strategies for influenza type A H1N1 control and prevention.
authors: Gansu Provincial Center for Disease Control and Prevention, Lanzhou 730000, Gansu, China.
authors: De-shan
authors: DS
authors: Yu
authors: Hong-yu
authors: HY
authors: Li
authors: Xu-ming
authors: XM
authors: Gao
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000914:Antibodies, Viral / Q000097:blood*; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000276:immunology; D007251:Influenza, Human / Q000097:blood* / Q000453:epidemiology / Q000276:immunology / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D055815:Young Adult
chemical_list: D000914:Antibodies, Viral; D007252:Influenza Vaccines