Dictionary of Tropical Medicine


A non-venereal disease caused by Treponema pertenue and characterised by skin and bone lesions similar to those seen in secondary syphilis. The disease is caused by a spirochaete morphologically, immunologically and serologically identical to Treponema pallidum, the cause of syphilis. Yaws is clinically very similar to another non-venereal treponematose, pinta, caused by T. carateum and found in South America and the Caribbean.


A single-celled fungus that produces buds (blastospores). Medically important species include Cryptococcus neoformans, the cause of cryptococcal meningitis.

Yeast-like fungus

A yeast that produces pseudohyphae (germ tubes). Includes Canidida albicans and similar species that infect humans such as C. tropicalis and C. krusei. Fungi belonging to this genus cause candidiasis (thrush) in humans.

Yellow Fever

An arboviral (flavivirus) disease, also a zoonosis, being essentially a disease of forest monkeys, which under certain conditions can be transmitted to humans. A vaccine is available.


Pus forming