What type of agent is syphilis?

Syphilis is caused by the bacterium Treponema pallidum, which is a type of spirochete. This agent is a highly infectious pathogen that primarily spreads through sexual contact but can also be transmitted from mother to fetus during pregnancy. The infection progresses through distinct stages: primary, secondary, latent, and tertiary syphilis, each with varying symptoms and health implications. Early diagnosis and treatment with antibiotics are crucial for effective management.