01:146:328 Lecture Notes - Lecture 11: Trichuris Trichiura, Trichuris, Adenophorea
Document Summary
Most common ntds, infections are acquired through contact with soil contaminated with either parasite eggs or larva. Three most important of sth: trichuris, ascaris, hookworm. *** all 3 are known as the unholy trinity *** - most often people are infected with all three, polyparasitism: trichuris trichiura, introduction, the thin end is the mouth end. Adenophorea class (cid:498)whipworm(cid:499) looks like a whip: life cycle figure 16. 2. Egg exits in feces: very thick shell to be resist to external environmental conditions (desiccation, exposure to other things in soil, morphology, opercular knobs at the ends. Embryonation: relies on environment that has moisture and shade, develops to l3 stage (inside egg) Swallowed by host: hatches inside host small intestine. L3 comes out and penetrates into the intestinal villi: molts 2 times within the villi adult. Adults migrates to the lumen of the cecum and large intestine.