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30 Cards in this Set
- Front
- Back
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3 groups of helminths
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cestodes (flat), nematodes
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Acquisition (3 steps)
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ingestion (we are definitive host)
skin penetration by larvae (we are definitive host) unintended host: larva migrans |
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Pinworm eggs can be seen via what?
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Scotch tape spread on perianal region
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Common population of pinworms?
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children
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Which helminth has a migratory phase from GI tract through circulatory system to lungs in order to mature?
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Ascaris
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Results from adult Ascaris worms?
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More physical changes than anything else
-insusseception or GI tract twists |
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Which helminths are present in small bowels and cause very few problems unless there are large numbers?
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Whipworm (trichuris)
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Shape of whipworm
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lemon shaped eggs, corkscrew end to worm
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How is trichenella transmitted?
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Ingestion of undercooked meat (or bear)
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Transmission of hookworm
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Larvae from contaminated soil (fecally), penetrates skin
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Ancylostoma duodenale causes what problems
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anemia (blood in stool from multiple wounds in GI)
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3 steps for hookworm eradication in NC
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1. Build an outhouse
2. Wear shoes 3. Deworm people who had hookworm |
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Strongyloides is what type of species?
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human round worm
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Key to strongyloides life cycle in humans
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autoinfection, can penetrate skin or colon wall
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Name for migrating larvae just under skin
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larva currens (with autoinfection of strongyloid)
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Where does cutaneous larva migrans come from? Where does it affect?
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Dog feces, can't penetrate past cutaneous layer, so remains superficial
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Where does visceral larva migrans come from? Where does it affect?
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Dog/cat poop; penetrates and spread throughout body (including lung and eye)
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Why is Baylisascaris more common?
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Comes from raccoons/wild animals, more difficult to break chains
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Tx for anisakiasis; common source?
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colonoscopy, pull larvae out; uncooked fish/sushi
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Cestodes are what type of organism?
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Tapeworms
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two main types of tapeworms
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Tinea saginata, tinea solium
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How are tapeworms obtained?
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eating the larvae (can eat eggs in certain situations)
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Which tapeworm form is found in pig?
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Tinea solium
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Definitive host of tinea solium
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humans
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Intermediate host of tinea solium
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pig and humans
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Potential dissemination of tinea solium
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cysticercosis in muscle
-can also spread to brain |
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Definitive host of Echinococcus granulosus
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dog (intermediate host of sheep/goats)
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Organism causing hydatid cyst/disease
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Echinococcus granulosus
-more commonly liver and lung, can be brain |
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Definitive host of Hymenolepsis nana
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humans (pretty common)
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Definitive host of trematodes
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humans (liver, lung, etc.)
-larvae found in seafood (can come from crawfish) |
