Parasites/Viruses – Flashcards
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| Discuss the differences between the different types of protozoa and metazoan. |
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| Protozoa: single-celled.              Metazoa: multicellular. |
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| Protective measure of protozoa |
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•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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| Entamoeba histolytica: Disease, Transmission |
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•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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| E. Histolytica Epidemiology |
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 •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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| E. histolytica Life cycle |
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