Dracunculus medinensis
Updated: Wikipedia source
Dracunculus medinensis (Guinea worm, dragon worm, fiery serpent) is a nematode that causes dracunculiasis, also known as Guinea worm disease. The disease is caused by the female which, at around 80 centimetres (31 inches) in length, is among the longest nematodes infecting humans. The length of specimens exhibits extreme sexual dimorphism, as the longest recorded male Guinea worm is only 4 cm (1+1⁄2 in). Guinea worm disease is on target to be the second infectious disease of humans to be eradicated, after smallpox, and the D. medinensis species would be made extinct to accomplish it. It was formerly endemic to a wide swath of Africa and Eurasia; as of 2023, it remains endemic in five countries: Chad, Mali, South Sudan, Angola and Ethiopia, with most cases in Chad. Guinea worm spread to Angola c. 2018, and it is considered endemic there. Infection of domestic dogs is a serious complication in Chad. The common name "Guinea worm" is derived from the Guinea region of Western Africa.