ZOOL452 Lecture Notes - Trichinella, Helminths, Strongyloides Stercoralis

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Intestinal helminths: host finding, passive through eggs, ingested larvae (trichinella), etc, active through penetration of the skin. (eg: hookworms, strongyloides stercoralis, autoinfection (cid:224) trichuris trichiura and enterobius (pinworms, intestinal helminthes (cid:224) evolved recently to be parasites of hosts, establishing in the host, site selection is involved, most of the gi helminths like the upper half of the small intestines, diurnal migration may happen to follow the food bolus or reselect the primary site of occupation, males and females try to find each other in order to mate, most helminthes do not reproduce in the host. Eg: proteocephalus parasites of fish (similar life cycle to the diphyllobothrium latum, which infects humans, fish, and copepods: proteocephalus pinguis : native to north america. cestode that uses the northern pike, esox lucius, and the chain pickerel, esox reticulus, as hosts, adults are found in the intestines and the villi of the pike.

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