Term
| Discuss the differences between the different types of protozoa and metazoan. |
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Definition
| Protozoa: single-celled. Metazoa: multicellular. |
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Term
| Protective measure of protozoa |
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Definition
•Cyst form: survival in harsh conditions
•Not as metabolically active
•Protozoa without cysts have direct transmission via arthropod vector (eg. malaria)
•Evade immune system via surface antigen variation |
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Term
| Entamoeba histolytica: Disease, Transmission |
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Definition
•Causes amebiasis(b for bloody diarrhea)
•Amebic dysentery
•Pseudopod-forming protozoan
•Lytic effect on cells
•Induces apoptosis
•Bloody diarrhea
•Found world-wide
•In the U.S. associated with camping
•Drinking contaminated water
•Transmission
•Fecal-oral
•Carrier state, cysts passed in stool
•Usually food-borne
•Contamination by food handlers, food grown in contaminated soil
•Contaminated water, oral sex less common
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Term
| E. Histolytica Epidemiology |
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Definition
•At risk groups
•Travelers to endemic area (camping/hiking), immigrants, MSM, IC pts, institutionalized
•10% of world population infected
•40,000-110,000 deaths/yr (second only to malaria)
•4% prevalence in U.S.
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Term
| E. histolytica Life cycle |
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Definition
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