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