What is syphilis?

Syphilis is a rare bacterial infection spread through sexual contact that affects the body in stages.

Definition:

Source: http://www.mayoclinic.org/diseases-conditions/syphilis/basics/definition/con-20021862?utm_source=Google&utm_medium=abstract&utm_content=Syphilis&utm_campaign=Knowledge-panel

Photo source:http://www.swissinfo.ch/eng/syphilis-cases-on-the-rise/28930352