![]() People with light soil-transmitted helminth infections usually have no symptoms. One kind of hookworm ( Ancylostoma duodenale) can also be transmitted through the ingestion of larvae. Hookworm infection is transmitted primarily by walking barefoot on contaminated soil. They hatch in soil, releasing larvae (immature worms) that mature into a form that can penetrate the skin of humans. This can happen when hands or fingers that have contaminated dirt on them are put in the mouth or by consuming vegetables and fruits that have not been carefully cooked, washed or peeled. People are infected with Ascaris and whipworm when eggs are ingested. Ascaris and hookworm eggs become infective as they mature in soil. If an infected person defecates outside (near bushes, in a garden, or field) or if the feces of an infected person are used as fertilizer, eggs are deposited on soil. ![]() Soil-transmitted helminths live in the intestine and their eggs are passed in the feces of infected persons. These STHs are considered neglected tropical diseases (NTDs) because they inflict tremendous disability and suffering yet can be controlled or eliminated. Soil-transmitted helminth infection is found mainly in areas with warm and moist climates where sanitation and hygiene are poor, including in temperate zones during warmer months. approximately 576-740 million with hookworm.approximately 604-795 million with whipworm.approximately 807-1,121 million with Ascaris. ![]() A large part of the world’s population is infected with one or more of these soil-transmitted helminths: ![]() Soil-transmitted helminths refer to the intestinal worms infecting humans that are transmitted through contaminated soil (“helminth” means parasitic worm): Ascaris lumbricoides (sometimes called just “ Ascaris“), whipworm ( Trichuris trichiura), and hookworm ( Ancylostoma duodenale and Necator americanus). ![]()
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