What is the name of the serious STI that can lead to fatal outcomes if untreated?

Syphilis is a serious sexually transmitted infection (STI) that can lead to severe health complications and even fatal outcomes if left untreated. It is caused by the bacterium Treponema pallidum and progresses through several stages, each with different symptoms. If the disease is not detected and treated in its early stages, it can advance to tertiary syphilis, which can cause significant damage to organs such as the heart, brain, and nervous system, potentially resulting in death.

This condition highlights the importance of early diagnosis and effective treatment, typically with antibiotics like penicillin. Understanding the seriousness of untreated syphilis reinforces the need for regular STI testing and safe sex practices to prevent transmission and complications associated with this infection.