Medical helminthology: The field of medicine that pertains to helminths (worms) capable of disease in people. For more about these worms, see " Helminth ."

The public health impact of medical helminths is appreciable. Two billion people are infected by soil-transmitted helminths such as Ascaris , hookworms, and Trichuris trichiura and by schistosomes. Early childhood infections by soil-transmitted helminths delays physical and cognitive development . Other widespread helminthic infections include onchocerciasis , lymphatic filariasis , dracunculiasis ( Guinea worm disease ), and food-borne trematode and tapeworm infections. All of these infections cause chronic morbidity and debilitation.

Medical helminths need to develop in a parasitized host, and sometimes this involves several disparate hosts. Helminth parasites are more complex than free-living helminths, because they have evolved mechanisms to deal with the different environments of their various hosts and living conditions. They have developed host-finding behaviors, exquisite migration patterns within each host, and the ability to evade the host immune and protective responses.

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