Most common parasites in humans
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Symbiotic relationships between a parasite and a host can have beneficial effects, even changing human personality and evolution. Often, however, the damage outweighs the positives. New Scientist investigates some of the most common human parasites and the damaging effects they can have. Necator americanus This parasitic nematode worm begins life outside the body and is transmitted through contaminated water, or fruits and vegetables. The hookworm larvae grow inside the human intestines where they attach to the wall of the intestine and drink the blood of the host, sometimes causing a form of anaemia called anchylostomiasis.
Parasitic infections, caused by intestinal helminths and protozoan parasites, are among the most prevalent infections in humans in developing countries. In developed countries, protozoan parasites more commonly cause gastrointestinal infections compared to helminths. Intestinal parasites cause a significant morbidity and mortality in endemic countries. Helminths are worms with many cells. Nematodes roundworms , cestodes tapeworms , and trematodes flatworms are among the most common helminths that inhabit the human gut. Usually, helminths cannot multiply in the human body. Protozoan parasites that have only one cell can multiply inside the human body.
Human Intestinal Parasites
Intestinal parasites cause significant morbidity and mortality.
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Contact Us. Numerous parasites can be transmitted by food including many protozoa and helminths. In the United States, the most common foodborne parasites are protozoa such as Cryptosporidium spp. Many of these organisms can also be transmitted by water, soil, or person-to-person contact. Occasionally in the U.