title: Chlamydia infection in individuals reporting contact with sexual partners with chlamydia: a cross-sectional study of sexual health clinic attendees.
abstract: OBJECTIVE
  We aimed to ascertain the proportion of positive, and predictive factors of chlamydia infection among females, heterosexual males and men who have sex with men (MSM) presenting to a sexual health service reporting contact with a chlamydia infected sexual partner.
  
  
  METHODS
  A cross-sectional analysis of patients attending the Melbourne Sexual Health Centre from October 2010 to September 2013. Behavioural data obtained using computer assisted self-interview were analysed to determine factors predictive of chlamydia.
  
  
  RESULTS
  Of the 491 female, 808 heterosexual male, and 268 MSM chlamydia contacts, the proportion diagnosed with chlamydia were 39.9% (95% CI 35.7% to 44.3%), 36.1% (95% CI 32.9% to 39.9%) and 23.5% (95% CI 18.8% to 29.0%), respectively. Female chlamydia contacts were more likely to have chlamydia if age <25 (adjusted OR (AOR) 1.86, 95% CI 1.12 to 3.10) or if they reported inconsistent condom use during vaginal sex with a regular male partner (AOR 2.5, 95% CI 1.12 to 6.14). Heterosexual male contacts were more likely to have chlamydia if age <25 (AOR 1.69, 95% CI 1.25 to 2.28) or if they had a regular female sexual partner (AOR 1.38, 95% CI 1.03 to 1.85). In MSM urethral chlamydia was diagnosed in 8.8%, rectal chlamydia in 20.2%, and 3.9% at both sites. MSM were more likely to have chlamydia if they had a regular male sexual partner (OR 2.12, 95% CI 1.18 to 3.81).
  
  
  CONCLUSIONS
  This study of female, heterosexual male, and MSM presentations with self-reported chlamydia contact provides insight into the likelihood and predictive factors of infection. The data may inform policy and individual clinical decision making regarding presumptive treatment of chlamydia contacts.
authors.affiliation: Department of Alfred Health, Melbourne Sexual Health Centre, Melbourne, Victoria, Australia Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Victoria, Australia.
authors.forename: Sarah
authors.initials: S
authors.lastname: Huffam
authors.affiliation: Department of Alfred Health, Melbourne Sexual Health Centre, Melbourne, Victoria, Australia Faculty of Medicine, Department of Nursing and Health Sciences, Central Clinical School, Monash University, Melbourne, Victoria, Australia.
authors.forename: Eric P F
authors.initials: EP
authors.lastname: Chow
authors.affiliation: Department of Alfred Health, Melbourne Sexual Health Centre, Melbourne, Victoria, Australia Faculty of Medicine, Department of Nursing and Health Sciences, Central Clinical School, Monash University, Melbourne, Victoria, Australia.
authors.forename: Christopher K
authors.initials: CK
authors.lastname: Fairley
authors.affiliation: Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Victoria, Australia.
authors.forename: Jane
authors.initials: J
authors.lastname: Hocking
authors.affiliation: Department of Alfred Health, Melbourne Sexual Health Centre, Melbourne, Victoria, Australia.
authors.forename: Joanne
authors.initials: J
authors.lastname: Peel
authors.affiliation: Department of Alfred Health, Melbourne Sexual Health Centre, Melbourne, Victoria, Australia Faculty of Medicine, Department of Nursing and Health Sciences, Central Clinical School, Monash University, Melbourne, Victoria, Australia.
authors.forename: Marcus
authors.initials: M
authors.lastname: Chen
mesh_terms: D000328:Adult; D001315:Australia / Q000453:epidemiology; D002690:Chlamydia Infections / Q000453:epidemiology* / Q000523:psychology; D017280:Condoms / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D016015:Logistic Models; D008297:Male; D010342:Patient Acceptance of Health Care / Q000523:psychology / Q000706:statistics & numerical data*; D011322:Primary Prevention / Q000458:organization & administration*; D011446:Prospective Studies; D012725:Sexual Behavior / Q000523:psychology / Q000706:statistics & numerical data*; D012747:Sexual Partners / Q000523:psychology*
keywords: CHLAMYDIA INFECTION; PARTNER NOTIFICATION; SEXUAL HEALTH