Syphilis: A sexually transmitted disease caused by a bacteria (Treponema pallidum). The condition is often asymptomatic in the early stages but one or more sores may be present in the early stages. Untreated syphilis usually results in remission of visible symptoms but further severe damage may occur to internal organs and other body tissues which can result in death.
Yaws: A rare infections disease caused by the spiral-shaped bacteria Treponema pertenue. The disease consists of three phases: skin lesions are followed by bone, joint and widespread skin symptoms and finally by inflammation and destruction of cartilage in the nose, pharynx and palate. Transmission can be through direct contact with infected skin, insect bites or sex.