title: Prevalence of Chlamydia pneumoniae in healthy children and in children with respiratory tract infections.
abstract: BACKGROUND
  Chlamydia pneumoniae causes respiratory tract infections in adults, but little is known about its significance for acute or persistent respiratory tract infections in children.
  
  
  METHODS
  We studied the prevalence of C. pneumoniae by polymerase chain reaction in children younger than the age of 11: 85 consecutive children with respiratory tract infections; and 93 children presumed to be healthy. Throat swabs for PCR analysis were taken from all children, and serology was done for 54 of the 85 sick children and from all but one of the presumed healthy children positive for C. pneumoniae by PCR.
  
  
  RESULTS
  PCR was positive in 38 (45%) of the sick children and in 5 (5.7%) of the healthy children. All but 2 of 19 sick children with serologic findings suggesting recent or ongoing infection with C. pneumoniae were positive by PCR. Most children positive for C. pneumoniae by PCR had upper respiratory tract infections. Four children had recurrent respiratory tract infections and otitis media with effusion treated by tubal insertion.
  
  
  CONCLUSIONS
  The findings suggest that C. pneumoniae is common among children with respiratory tract infections.
authors.affiliation: Department of Family Medicine, University Hospital, Uppsala, Sweden. g-falck@algonet.se
authors.forename: G
authors.initials: G
authors.lastname: Falck
authors.forename: J
authors.initials: J
authors.lastname: Gnarpe
authors.forename: H
authors.initials: H
authors.lastname: Gnarpe
mesh_terms: D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D016993:Chlamydophila pneumoniae / Q000187:drug effects / Q000302:isolation & purification*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D016133:Polymerase Chain Reaction; D012141:Respiratory Tract Infections / Q000382:microbiology*