helminth GI tract diseases
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Created by:
normansilva on April 28, 2011
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Description:
some common helminth infections of the human GI tract
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18 terms
Terms | Definitions |
|---|---|
 cycle A | helminth develops in intestine; egg released in feces; egg ingested by new host |
| cycle B | helminth matures in intestine; eggs released with feces; larvae hatch and develop in environment; larvae penetrate new hosts skin |
| Cycle C | helminth matures in human intestines; egg released into environment; eggs eaten by grazing animals; larval form encyst in animals tissue; human eats infected meat |
| Cycle D | eggs are released from human; humans are infected through ingestion or direct penetration by larval phase |
| Trichuris trichiura | cycle A, humans only host, cause hemorrhaging of bowel, 3000-5000 eggs laid a day, whipworm |
| Enterobius vermicularis | cycle A, common in children of temperate zones, sticky eggs and anal itching lead to self inoculation and spreading, pinworm |
| Taenia solium | Cycle c, where humans and pigs in close proximity, 16' long, few symptoms, pork tapeworm |
| whipworm | Trichuris trichiura, Cycle A |
| pinworm | Enterobius vermicularis, Cycle A |
| pork tapeworm | Taenia solium, Cycle C |
| helminth migratory symptoms | arise when helminth larvae penetrate the intestines and enter the lymphatic or circulatory system, exit into the glottis and are swallowed, eosinophilia common |
| Ascaris | cycle A, migratory rout marked by inflammatory symptoms, intestinal roundworm |
| Strongyloides stercoralis | cycle B, migratory, can complete life cycle both in and out of body, threadworm |
| Trichinella spp. | cycle C, whole lifecycle in host, migratory cycle ends in skeletal muscles |
| Schistosoma | Cycle D, egg uses snail as intermediate host, penetrate through human hair follicles when in contaminated water, monogamous when mated, antigen cloaking, causes liver disease |
| intestinal roundworm | Ascaris |
| threadworm | Strongyloides stercoralis |
| Schistosoma | causes liver disease |
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