title: Strategy for screening pregnant women for chlamydial infection in a low-prevalence area.
abstract: OBJECTIVE
  To assess the prevalence and risk factors for chlamydial infection in pregnant women in the Quebec City area and to propose strategies for a screening program.
  
  
  METHODS
  From January 1990 to July 1991, pregnant women from six centers were cultured for Chlamydia trachomatis. One hundred thirty-six with positive results and 536 with negative results were included in a case-control study on risk factors for this infection.
  
  
  RESULTS
  The prevalence of C trachomatis was 1.9% (136 of 7305). In a logistic regression analysis, young age (P < .0001, test for trend), nulliparity (odds ratio [OR] 3.3; P < .00001), and a new sexual partner in the last year (OR 3.3; P = .0012) were independently associated with infection. With screening restricted to pregnant women under age 25 or those with at least one risk factor, 81.7% of women positive for C trachomatis would have been detected, whereas only 40.6% of all women would have been cultured.
  
  
  CONCLUSIONS
  In a low-prevalence area for chlamydial infection in pregnant women, pre-screening criteria could optimize the use of specific diagnostic tests.
authors.affiliation: Département de Médicine Sociale et Préventive, Université Laval, Québec, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Alary
authors.forename: J R
authors.initials: JR
authors.lastname: Joly
authors.forename: J M
authors.initials: JM
authors.lastname: Moutquin
authors.forename: M
authors.initials: M
authors.lastname: Labrecque
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D002690:Chlamydia Infections / Q000453:epidemiology*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008403:Mass Screening; D015999:Multivariate Analysis; D016017:Odds Ratio; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000453:epidemiology*; D015995:Prevalence; D011792:Quebec / Q000453:epidemiology; D012307:Risk Factors; D014504:Urban Health