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13 Cards in this Set
- Front
- Back
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1. Define definitive host
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a host in which a parasite reproduces sexually/ cats in Toxoplasma gondii
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Define intermediate host
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a host in which asexual reproduction or larval development occurs
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Define vector
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Vector is a transmitting agent (mosquito is the vector for malaria transmissin to humans)
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2. what are the key factos that would lead you to suspect that a prasite (rather than a viurs or baferium) was responsible for some GI illness?
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1. potential for exposure (water sources and travel)
2. eosinophilia*-common in helminthic infections 3. prsence of parsite 4. larva 5. eggs in stools 6. blood 7. urine 8. tissue biopsy 9. increased IgE antibody levels-seen in worm infections |
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4. Cite 2-3 exmpes where insect vectors transmit parswitic orgnaims to humans
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4. Malaria-mosquitos
5.ticks-lyme disease |
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5. What are the probably roles of IgE anitbody and eosinohpils in combingtg parasitic infections:
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IgE cause mast cells to react to locialize the esoinohpls to the parasite to enhance the anti-parasitic function; Eosinophils attach paraistes via degranulation and release MBP
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6. What's the difference b/n a trophoziotie and a cyst?
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Trophozoite is the stage in which the parasite is metaboliically active and motile; cyst stage is when it tries to protect itself from the evnironment and is the most infective satge to humans b/c it can survive in feces
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Example of a cyst form
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/ cysts in Toxoplams gondii that are passed in cats feces; Entamoeba histolgyics (dysentery) ctyst in human feces contaiminate water
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Examples of a trophozoite
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in Schistomsoma mansoni (blood fluke)--miracidia hatch out of eggs and enter snail..development in smail release infectious cercariae
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reservoir
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species where the parsite can survive and proflierate but not neceaarily cause disease (snail in blood lfuike)
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Name 3 of 6 agents for paraiste infections
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1. anti-malarils
2. atrovaquone-pneumonia and toxoplasma gondii 3. suflonamide & folate antagonists |
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Name other 3 of 6 agents for parasites
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4. metronidozole-trich,ameboas,giardia
5.mebendazole,ablendaozole-worm infections 6.praziquantel-helm,cest,trema |
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What are the key factors for preenting intestional infections?
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improved santitaiton & hygiene
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