title: Seroprevalence of Chlamydia pneumoniae infection in Taiwan.
abstract: OBJECTIVE
  To survey the seroprevalence of Chlamydia pneumoniae (C. pneumoniae) infection in healthy subjects in Taiwan.
  
  
  METHODS
  We used microimmunofluorescence antibody assay to survey the prevalence of antibodies to C. pneumoniae in 620 serum samples from healthy subjects aged 6 months to 86 years in Taiwan.
  
  
  RESULTS
  The mean prevalence (+/-SD) of IgG antibodies against C. pneumoniae at titer greater than or equal 1:16 was 55.8% (range 7.8-81.8%). The antibody prevalence was low in children under the age of 10 years (7.8%), and increased rapidly with age. Most individual acquired infection during the second and third decades of life with highest antibody prevalence reached up to 81.8% at fifth decade of life and remained high (70%) thereafter.
  
  
  CONCLUSIONS
  Chlamydia pneumoniae infection is highly endemic in Taiwan. These data contribute to the understanding of asymptomatic infections with C. pneumoniae in general population and should serve as a basis for studies on the role of C. pneumoniae infections and their related diseases.
authors.affiliation: Department of Medical Technology, College of Medicine, National Cheng Kung University, 1 University Road, Tainan, Taiwan.
authors.forename: T M
authors.initials: TM
authors.lastname: Lin
authors.forename: C C
authors.initials: CC
authors.lastname: Kuo
authors.forename: W J
authors.initials: WJ
authors.lastname: Chen
authors.forename: F J H
authors.initials: FJ
authors.lastname: Lin
authors.forename: H L
authors.initials: HL
authors.lastname: Eng
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016009:Chi-Square Distribution; D002648:Child; D002675:Child, Preschool; D002690:Chlamydia Infections / Q000097:blood / Q000453:epidemiology* / Q000276:immunology; D016993:Chlamydophila pneumoniae / Q000276:immunology*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D016036:Seroepidemiologic Studies; D013624:Taiwan / Q000453:epidemiology