Trichomonas Vaginalis & Male Urinary Tract Infections: Symptoms & Treatment

Trichomonas vaginalis in Men: Urethritis and Beyond

Trichomonas vaginalis is a flagellated protozoan sexually transmitted infection (STI). Men are often asymptomatic carriers but can develop urethritis.

Clinical Presentation in Males

• Asymptomatic: 70–85% of infected men.
• Symptomatic urethritis:
  • Urethral discharge (clear, mucopurulent, frothy)
  • Dysuria, urinary frequency, urgency
  • Penile irritation, pruritus
  • Post-void dribbling
• Complications (rare): Prostatitis, epididymitis, infertility (debated).

Diagnosis

• NAAT (PCR/TMA) on urine or urethral swab: Gold standard (sensitivity >95%).
• Microscopy (wet mount): Low sensitivity in men (50–60%); motile trichomonads visible.
• Culture: More sensitive than microscopy, slower.
• Rapid antigen tests: Lower sensitivity.

Treatment

• First-line: Metronidazole 2 g PO single dose OR 500 mg PO BID × 7 days (latter preferred for better adherence/cure).
• Alternative: Tinidazole 2 g PO single dose.
• Partner treatment: Essential — treat all recent sexual partners simultaneously to prevent reinfection.
• Abstinence: Until both partners completed treatment and symptoms resolved.
• HIV/STI screening: Trichomonas increases HIV acquisition/transmission risk.

Resistance

Metronidazole resistance ~5–10%. If treatment fails: verify adherence, re-test, consider tinidazole, higher-dose metronidazole (2 g daily × 5–7 days), or referral for susceptibility testing.

Prevention

• Condom use
• Partner reduction
• Regular STI screening

Men with urethritis symptoms should be tested for T. vaginalis, C. trachomatis, N. gonorrhoeae, and M. genitalium.