hookworm

Parasitic roundworm (see worm) with hooks around its mouth. It lives mainly in tropical and subtropical regions, but also in humid areas in temperate climates. The eggs are hatched in damp soil, and the larvae bore into the host's skin, usually through the soles of the feet. They make their way to the small intestine, where they live by sucking blood. The eggs are expelled with faeces, and the cycle starts again. The human hookworm causes anaemia, weakness, and abdominal pain. It is common in areas where defecation occurs outdoors. (Genus Necator.)