Health Guide

Sexually Transmitted Infections (STIs): Testing and Treatment

Master STI management with this comprehensive guide. Learn common infections, transmission, recognition, testing methods, treatment options, partner notification, and prevention strategies for sexual health and disease prevention.

STI Overview: Understanding Sexually Transmitted Infections

Sexually transmitted infections affect 20 million people annually in US with significant health consequences. Many STIs cause no symptoms, making testing critical. Early detection and treatment prevents serious complications and transmission. Stigma barriers often delay care.

STI Facts:

  • 20 million new STI cases annually in US
  • Up to 50% of STIs asymptomatic initially
  • Young adults (15-24) have highest rates
  • Untreated STIs cause serious complications (infertility, cancer, disability)
  • Regular testing and prevention crucial for sexual health

Common STIs: Recognition and Transmission

Chlamydia trachomatis

  • Transmission: Bacterial, sexual contact
  • Symptoms: Often asymptomatic, vaginal/urethral discharge, pain
  • Testing: Nucleic acid amplification (NAAT) - most sensitive
  • Treatment: Azithromycin or doxycycline
  • Complications: PID, ectopic pregnancy, infertility

Gonorrhea (Neisseria gonorrhoeae)

  • Transmission: Bacterial, sexual contact
  • Symptoms: Often asymptomatic, yellow-green discharge, dysuria
  • Testing: NAAT preferred, culture alternative
  • Treatment: Ceftriaxone with azithromycin or doxycycline
  • Complications: PID, epididymitis, infertility, disseminated infection

Syphilis (Treponema pallidum)

  • Transmission: Bacterial, sexual contact, vertical transmission
  • Primary: Painless ulcer (chancre) at infection site
  • Secondary: Rash, systemic symptoms (fever, lymphadenopathy)
  • Testing: RPR/VDRL (nontreponemal), FTA-ABS (treponemal)
  • Treatment: Penicillin (gold standard)

Herpes Simplex Virus (HSV-1 and HSV-2)

  • Transmission: Viral, sexual contact, mucous membrane
  • Symptoms: Painful vesicles, lymphadenopathy, systemic illness
  • Recurrence: Common, typically decreases over time
  • Testing: Viral culture, PCR, serology
  • Treatment: Antivirals (acyclovir, valacyclovir)

Human Papillomavirus (HPV)

  • Transmission: Viral, genital contact
  • Types: Low-risk (warts), high-risk (cervical cancer)
  • Symptoms: Genital warts, often asymptomatic
  • Testing: HPV test for cervical screening
  • Prevention: Vaccine (Gardasil, Cervarix) - most effective

Trichomonas vaginalis

  • Transmission: Parasitic, sexual contact
  • Symptoms: Vaginal discharge (frothy, yellow-green), dysuria, itching
  • Testing: Wet mount, NAAT (sensitive)
  • Treatment: Metronidazole or tinidazole
  • Note: Also affects men (usually asymptomatic)

Testing Recommendations and Intervals

Annual Screening (Sexually Active)

  • All sexually active persons <25: Chlamydia and gonorrhea
  • Women ≥25 with risk factors: Chlamydia and gonorrhea
  • Men who have sex with men: Chlamydia, gonorrhea, syphilis
  • Pregnant women: Chlamydia, gonorrhea, syphilis, HIV

One-Time Testing

  • All persons 15-65: HIV testing at least once
  • Syphilis: Once in lifetime minimum
  • Hepatitis B and C: Once if risk factors

Testing After Exposure

  • Chlamydia/gonorrhea: Test 2 weeks post-exposure (window period)
  • Syphilis: Test 3-4 weeks after exposure (antibodies develop)
  • HIV: Test at 18-45 days, 3 months (RNA and antibody tests)
  • Repeat testing may be needed due to window periods

Prevention Strategies: Reducing STI Risk

Safer Sex Practices

  • Condoms: Reduce transmission 95% for most STIs
  • Dental dams: Protect during oral-genital contact
  • Regular testing: Early detection and treatment
  • Partner communication: Discuss STI status and testing
  • Limit partners: Fewer partners = lower risk

Vaccination

  • HPV vaccine: Prevents multiple cancer-causing types
  • Ages: 11-26 recommended, can give up to 45
  • Effectiveness: >99% prevention if given before exposure
  • Hepatitis B vaccine: For sexually active without prior immunity

Risk Reduction Counseling

  • Consistent condom use education
  • Communication with partners
  • Stress testing and monitoring
  • Treatment adherence importance

Treatment and Management

Partner Notification

  • Importance: Prevents reinfection and continued transmission
  • Methods: Patient referral, provider notification, expedited partner therapy
  • Timing: Notify within 2 weeks of diagnosis
  • Testing: Partners should be tested even if asymptomatic

Treatment Adherence

  • Take all medication as prescribed
  • Do not stop early even if symptoms resolve
  • Avoid sexual contact until treatment complete
  • Retest if symptoms persist after treatment

Key Takeaways: STI Prevention and Management

  • Understand STI transmission and recognize symptoms
  • Get regular STI screening per guidelines
  • Use condoms consistently and correctly
  • Communicate with partners about STI status
  • Seek prompt treatment if diagnosed
  • Notify partners of STI exposure
  • Complete full treatment course
  • Consider HPV vaccination to prevent cancer
  • Retest after treatment if indicated
  • Maintain regular screening for ongoing sexual health