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[Prevalence of genital Chlamydia trachomatis infection in the age group 18-29 years in Oslo].

BACKGROUND
Earlier Norwegian prevalence studies of genital C. trachomatis infection have mainly been carried out among women and in selected patient groups. We decided to do a population-based prevalence study among young men and women in Oslo. The study was done within the framework of the new Norwegian list patient system, in which each citizen is assigned to one particular doctor.


METHODS
Cross-sectional study. All patients 18-29 years old listed with a group practice in Oslo received a personal letter of invitation. We asked each person to submit a urine sample and fill in a questionnaire. The urinary samples were tested by means of a DNA amplification method. Non-respondents received one reminder.


RESULTS
685 persons were invited to participate, 234 responded (36%); 169 females (43%) and 65 males (25%). A total of 6 respondents (3%, 95% CI 1.2-5.5) tested positively, 4 of them were males. At least 51% of the females and 25% of the males had previously been examined for C. trachomatis, and at least 18% of the females and 8% of the males had received treatment. A total of 70% stated that they would see their doctor if they suspected a genital chlamydial infection.


INTERPRETATION
Opportunistic testing for C. trachomatis infection should be offered more frequently to young men. A national prevalence study of genital chlamydial infection should be carried out. The new list patient system offers new opportunities for research in primary medical care in Norway.