Syphilis is caused by the bacteria T. pallidum, a spiral shaped organism that moves throughout the body by splitting in two about once every day. The disease begins with a chancre which normally forms on the genital area. If untreated, this chancre will heal but the disease will progress possibly causing many complications- and in some instances death. Syphilis can now be effectively treated with penicillin or other antibiotics (for those allergic to penicillin). The widespread use of antibiotics has reduced the prevalence of syphilis significantly.