Trends in chlamydia and other sexually transmitted diseases in a university health service.

The incidence of sexually transmitted diseases in a primarily student-based patient population served by a university health service was reviewed because of the perception that the number of positive chlamydia tests was declining. The most striking finding that emerged was that there was, indeed, a persistent and steady decline in the rates of chlamydia infection over the study time period of 1989 to 1994. Other sexually transmitted diseases showed less definite declines or no significant change.