What is the scientific name of the incurable strain of syphilis commonly referred to by the military as black syphilis?

The incurable strain of syphilis often referred to as "black syphilis" is scientifically known as Treponema pallidum. This term is a general reference to advanced tertiary syphilis, which can lead to severe systemic complications but is not a distinct strain. The term "black syphilis" may also describe the dark lesions that can appear on the skin in advanced cases. Syphilis is primarily treated with antibiotics, particularly penicillin, but late-stage complications can be challenging to manage.