Characterizing patients with multiple sexually acquired infections: a multivariate analysis.

It has long been recognized that sexually transmitted diseases (STDs) may occur concurrently hence necessitating screening in individuals attending Genito-Urinary Medicine (GUM) clinics. However there are few data on individuals with more than one concurrent STD. Individuals attending the GUM Department in the Royal Infirmary of Edinburgh between 1990 and 1994 with the diagnosis of HIV infection, genital warts, genital herpes, non-specific genital infection (NSGI), gonorrhoea and syphilis were included in the study. A multivariate comparison was made between those presenting with multiple concurrent STDs and a control group comprising individuals with a solitary STD with respect to year of attendance, social class, location of acquisition of infection, sex, sexual orientation and age using a logistic regression model. A total of 680 of 9265 patients in the study period had more than one concurrent STD. Individuals in lower socio-economic class were at higher risk and older individuals at lower risk of multiple concurrent STDs. Multiple sexually acquired infections are common in individuals who attend GUM clinics. Age and socio-economic class were the only significant variables. Identification of populations at highest risk for multiple infection can direct interventions against all STDs.