1. Sexually Transmitted Diseases (STDs) Slideshow Pictures
2. A Visual Guide to Erectile Dysfunction
3. Take the Quiz on STDs

Syphilis is an infectious, often sexually transmitted, disease caused by the bacteria Treponema pallidum. The bacteria penetrate chafed skin or the mucous membranes.

• Transmission most often occurs when one person comes into contact with lesions on an infected person through sexual activity.

• Men are more vulnerable to contracting syphilis than women.

• The active disease is found most often amongmen and women aged 15-39 years.

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