Final answer:
Syphilis is a bacterial infection that can cause a sore, rash, and internal infection if untreated. It is caused by the bacterium Treponema pallidum and can be fatal. Medical treatment is necessary to prevent complications and death.
Step-by-step explanation:
Syphilis is a bacterial infection that can cause a sore, rash, and internal infection in later stages. If left untreated, it can be fatal. Syphilis is caused by the bacterium Treponema pallidum and typically starts with a small, painless sore on the genitals. It is important to seek medical treatment for syphilis to prevent further complications and potential death.