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Syphilis - Symptoms and causes - Mayo Clinic
STD Facts - Syphilis - Centers for Disease Control and Prevention
Syphilis - Wikipedia
Detailed STD Facts - Syphilis - Centers for Disease Control and Prevention
Syphilis - Diagnosis and treatment - Mayo Clinic
Syphilis: Symptoms, Causes, Diagnosis, Treatment - WebMD
Syphilis: Cause, Symptoms, Diagnosis, Treatment & Prevention
Syphilis - World Health Organization (WHO)
Syphilis - STD information from CDC
Syphilis -- Global - World Health Organization (WHO)