Sexually Transmitted Infections in Men Who Have Sex with Men
Key STIs in MSM
- Gonorrhea is one of the most common STIs among MSM, with prevalence rates of up to 16% reported in STD clinic settings, according to the American College of Physicians 1
- Chlamydia is highly prevalent among MSM with rates of approximately 12% in STD clinic settings, as reported by the American College of Physicians 1
- Syphilis disproportionately affects MSM, with studies documenting an 18% prevalence of HIV co-infection among patients with early syphilis in several large US cities, as reported by the Centers for Disease Control and Prevention (CDC) 2
- Syphilis outbreaks continue to occur in MSM communities despite declining rates in the general population, according to the CDC 3
Epidemiology and Risk Factors
- The presence of other STIs increases the risk of HIV acquisition and transmission, as reported by the CDC 4, 5
- Herpes Simplex Virus type 2 (HSV-2) is prevalent among MSM and can facilitate HIV transmission, according to the CDC 2, 5
Screening Recommendations
- The CDC recommends annual screening for all sexually active MSM and more frequent screening (every 3-6 months) for MSM with multiple or anonymous partners, those who use drugs during sex, or have partners who engage in these activities 6
- Comprehensive screening should include testing for gonorrhea and chlamydia at all potential exposure sites (pharynx, rectum, urethra), as recommended by the CDC 7
- Serologic testing for syphilis and HIV testing are also recommended by the CDC 6, 7
- Doxycycline post-exposure prophylaxis (doxy PEP) is now recommended by the CDC for MSM and transgender women who have had a bacterial STI diagnosed in the past 12 months 8
Clinical Implications
- Co-infections are common, particularly HIV and syphilis, requiring comprehensive testing, as reported by the CDC 2, 6
Prevention Strategies
- Partner notification and treatment are crucial to prevent reinfection, according to the American College of Physicians 1
- Risk reduction counseling should be provided to all MSM diagnosed with STIs, as recommended by the CDC 3
Lifetime HIV Risk for Black MSM with Recurrent STIs
Risk Factors and Interventions
- The CDC identifies persons with a history of STDs or more than one sex partner per year as higher-risk populations requiring intensive screening and prevention interventions, including those with recurrent bacterial STIs 9
- The presence of bacterial STIs increases HIV acquisition risk through multiple mechanisms, including mucosal inflammation and disruption, and increased HIV viral shedding 9, 10
- The CDC recommends comprehensive STI screening at all exposure sites (pharynx, rectum, urethra) every 3-6 months for high-risk MSM, and risk reduction counseling addressing the synergistic relationship between STIs and HIV transmission 10, 11
- Behavioral screening must identify actual risk behaviors (recurrent STIs, receptive anal intercourse) rather than accepting patient's subjective risk assessment, as the CDC recommends 10, 12