Heterosexual HIV Transmission Study (HATS). Prospective Cohort Study

At baseline and at 6-month intervals, participants are interviewed about their sexual behavior, drug and alcohol-related behaviors, and recent medical history, and are given a psychosocial assessment. They also undergo a physical exam, including pelvic exam and colposcopy, and have blood and urine specimens collected for HIV testing, drug screening, and STD evaluation. Additionally, participants are given pre- and post-test counseling and education, including information about social services. They are provided with basic gynecological care and either treatment or referral for medical problems.