ORIGINAL ARTICLE Chlamydia trachomatis re-infections in a population-based cohort of women

Objectives Re-infection with chlamydia may increase subsequent reproductive morbidity in women. The authors sought to identify characteristics associated with re-infection. Methods A cohort of all women aged 10e49 years with a notification of genital chlamydia in the Australian state of New South Wales during 1999e2008 was defined. Probabilistic linkage was used to identify women with repeat notifications in the same period. The risk of repeat notification was examined according to age and other characteristics using proportional hazards regression. Results Among 40 936 women in the cohort, 3236 had at least one repeat chlamydia notification over an average of 3.5 years of follow-up. The incidence o