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  1. Syphilis - Symptoms and causes - Mayo Clinic

  2. Syphilis: Cause, Symptoms, Diagnosis, Treatment & Prevention

  3. Syphilis - World Health Organization (WHO)

  4. Syphilis - Wikipedia

  5. Syphilis: Symptoms, Causes, Diagnosis, Treatment - WebMD

  6. Syphilis: Symptoms, Diagnosis, Treatment, and Prevention - Healthline

  7. STD Facts - Syphilis - Centers for Disease Control and Prevention

  8. Syphilis -- Global - World Health Organization (WHO)

  9. Detailed STD Facts - Syphilis - Centers for Disease Control and Prevention

  10. Syphilis - Diagnosis and treatment - Mayo Clinic