Hookworm is a parasitic worm (nematode) that lives on its host small intestine, human. There are two species of hookworms commonly infect humans, Ancylostoma duodenale and Necator americanus. Necator americanus are found in America, Sub-Saharan Africa, Southeast Asia, China, and Indonesia, while A. duodenale more in the Middle East, North Africa, India and southern Europe. About a quarter of world population infected by hookworm. Infections most often found in areas with warm and humid, with the level of poor hygiene. infective form of the worm it is a form filariform. After the worms are hatched from eggs, larvae emerged rhabditiform which will then develop into larvae filarifor.
