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Unformatted text preview: 5. Life cycle - complex (see text) III. Aschelminthes- Round worms A. Rounded body shape B. Dioecious - separate sexes C. Possess digestive system with mouth and anus. D. Life cycles - some include intermediate hosts, immature stages E. Enterobius vermicularis- Pin worms 1. Infection due to ingestion of eggs 2. In intestine eggs hatch → mature adults 3. At night adult female lays eggs on skin in perianal region (See fig. in text) F. Necator americanus- Hook worms 1. Mouth parts – hook-like - attach to intestinal wall 2. Feeds on blood of host 3. Eggs passed in stool 4. Larvae in soil penetrate skin of host 5. Blood → lungs → small intestine (see life cycle in text) G. Trichinella spiralis 1. Larvae encyst in muscle of infected pig. 2. Infection due to consumption of poorly-cooked pork. 3. Larvae becomes encysted in host muscles 2...
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This note was uploaded on 10/18/2011 for the course MCB 3020 taught by Professor White during the Spring '09 term at University of Central Florida.
- Spring '09