Syphilis is a sexually transmitted disease (STD) caused by the bacterium Treponema pallidum. It has often been called “the great imitator” because so many of the signs and symptoms are indistinguishable from those of other diseases.

  1. Syphilis, which is caused by the bacteria Treponema pallidum, typically first appears as a sore on the area where there has been sexual contact with the infected person.
  2. If the infection goes untreated, it can progress to affect the entire body.
  3. Syphilis typically has three stages - primary, secondary, and late (tertiary). There are different symptoms at each stage of the infection.