title: [Study on the effectiveness and cost-benefit of influenza vaccine on elderly population in Beijing city].
abstract: OBJECTIVE
  To estimate the effectiveness of inactivated influenza vaccine in elderly population.
  
  
  METHODS
  An quasi-experimental study was used. 590 elderly people who volunteered to receive the influenza vaccine were served as vaccine group, while 602 persons who did not want to receive the inoculation but could match the vaccine group were served as controls. One baseline and three follow-up surveys were carried out.
  
  
  RESULTS
  The protective rates of influenza like ill (ILI) as 52.38%, 36.84% and 37.89% with the decreasing rates of visits to ILI clinic as 45.16%, 50.54% and 50.54% were found after 1 month, 3 month and 6 month of inoculation of influenza vaccine; The protective rates of common cold, other respiratory tract or chronic disease were 49.54%, 64.54%, and 38.82%, respectively. The benefit-cost ratio was 4.98:1 in elderly population.
  
  
  CONCLUSIONS
  Influenza vaccination could decrease ILI incidence and recurrence rates of related chronic diseases on elderly population to provide better economic benefits for the elderly.
authors.affiliation: Department of Epidemiology, Public Health School of Peking University, Beijing 100083, China.
authors.forename: Min
authors.initials: M
authors.lastname: Liu
authors.forename: Gai-fen
authors.initials: GF
authors.lastname: Liu
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Si-yao
authors.initials: SY
authors.lastname: Wen
mesh_terms: D000368:Aged; D002681:China / Q000453:epidemiology; D003362:Cost-Benefit Analysis; D005260:Female; D006801:Humans; D007252:Influenza Vaccines / Q000191:economics* / Q000276:immunology; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D014611:Vaccination
chemical_list: D007252:Influenza Vaccines