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HIV Infections
Syphilis
Sexually Transmitted Diseases
Gonorrhea
Chlamydia Infections
Risk Factors
Prospective Studies
Prevalence
Cohort Studies
Viral Load
Cross-Sectional Studies
Baltimore
United States
CD4 Lymphocyte Count
Treponema pallidum
Chlamydia trachomatis
Homosexuality
Sexual Behavior
Intravenous Substance Abuse
Reagins
Co-Publications
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