TY - CHAP M1 - Book, Section TI - Endemic Treponematoses A1 - Lukehart, Sheila A. A1 - Giacani, Lorenzo A2 - Loscalzo, Joseph A2 - Fauci, Anthony A2 - Kasper, Dennis A2 - Hauser, Stephen A2 - Longo, Dan A2 - Jameson, J. Larry PY - 2022 T2 - Harrison's Principles of Internal Medicine, 21e AB - The endemic treponematoses are chronic diseases that are transmitted by direct contact, usually during childhood and, like syphilis, can cause severe late manifestations years after initial infection. These diseases are caused by very close relatives of Treponema pallidum subspecies pallidum, the etiologic agent of venereal syphilis (Chap. 182). Yaws, pinta, and endemic syphilis (bejel) have traditionally been distinguished from venereal syphilis by mode of transmission, age of acquisition, geographic distribution, and clinical features; however, there is overlap for each of these factors. Our “knowledge” about these infections is based on observations by health care workers who have visited endemic areas during the past 70 years. Except for the ongoing programs of mass drug administration (MDA) for yaws eradication promoted by the World Health Organization (WHO), virtually no well-designed studies of the natural history, diagnosis, or treatment of these infections have been conducted. The classically defined treponemal infections are compared and contrasted in Table 183-1. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/18 UR - accessmedicine.mhmedical.com/content.aspx?aid=1198223136 ER -