METHODS
Participants were 414 men and 203 women receiving services at an urban STI clinic in Cape Town, South Africa. The participating clinic is one of the largest public STI clinics in Cape Town. Patients historically have visited this clinic from areas throughout Cape Town because they are assured greater confidentiality than they are at neighborhood clinics. The patient population is approximately 25% female, and 90% of patients are indigenous (Black) Africans. Approximately half of all patients have previously received STI services. The estimated HIV prevalence among clinic patients is 25%, based on reactive tests among the approximately 50% of patients who accept HIV testing.