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Final_exam_study_guide_MT450 - Intestinal amoeba Entamoeba...

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Intestinal amoeba Entamoeba histolytica (Intestinal amoeba pathogen) Major disease pathology: bloody dysentery Specimen in which organism is found: stool/feces Diagnostic form of organism : trophozoite or cyst (ameba) Engulfs red blood cells , small central karyosome, evenly distributed peripheral chromatin; troph = 10-60 μ m, cyst = 10-20 μ m; troph has 1 nucleus, cyst up to 4; rounded blunt end chromatoid bodies in cyst. Infective form : cyst Vector : contaminated food/water Pathogenic/nonpathogenic/commensal : pathogenic Common Disease Name : Intestinal amebiasis --------------------------------------------------------------------------------------------------------------------- Entamoeba hartmanni (Intestinal amoebae) Major disease pathology: Specimen in which organism is found: stool/feces Diagnostic form of organism : trophozoite or cyst (ameba) Troph- 5 to 12 microns finely granular cytoplasm, evenly distributed peripheral chromatin, small central karyosome, nonprogressive motility Cyst- 5 to 50 microns, up to 4 nuclei, elongated chromatoid body with blunt smooth ends, central compact karyosome ** only entamoeba have peripheral nuclear chromatin*** Infective form : cyst Vector : contaminated food or drink Pathogenic/nonpathogenic/commensal : Nonpathogen Common Disease Name :”small race histolytica”, intestinal amoeba --------------------------------------------------------------------------------------------------------------------- Entamoeba coli (Intestinal amoeba) Major disease pathology: Specimen in which organism is found: stool/feces Diagnostic form of organism : trophozoite or cyst (ameba) Troph: 15 to 50 microns, coarsely granular cytoplasm, Unevenly distributed peripheral chromatin, Large discrete eccentric (off center) karyosome, Inclusions: bacteria, yeast, debris Cyst: 10 to 35 microns, mature cysts have 8 nuclei – up to 16 possible, splinter shaped chromatoid bodies with sharp pointed ends, large eccentric karyosomes
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Infective form : Cyst Vector : contaminated water or food Pathogenic/nonpathogenic/commensal : nonpathogenic Common Disease Name : Intestinal amoeba --------------------------------------------------------------------------------------------------------------------- Endolimax nana (Intestinal amoebae) Major disease pathology: Specimen in which organism is found: stool/ feces Diagnostic form of organism : trophozoite or cyst (ameba) Troph: 6 to 12 microns, granular cytoplasm, no periperhal chromatin, Large blot like karyosome, Inclusions: bacteria Cyst 5 to 10 microns, up to 4 nuclei, no peripheral chromatin, Large Karyosome (central), No visible chromatoid bodies Infective form : cyst Vector : contaminated food or water Pathogenic/nonpathogenic/commensal : nonpathogenic Common Disease Name : Intestinal Protozoan --------------------------------------------------------------------------------------------------------------------- Iodamoeba butschlii (Intestinal amoebae) Major disease pathology: Specimen in which organism is found: stool/feces Diagnostic form of organism : trophozoite or cyst (ameba) Troph: 8 to 20 microns, granularvacuolated cytoplasm, no peripheral chromatin, large karyosome, Inclusions: bacteria and yeast, sluggish nonprogressive motility Cyst: 5 to 20 microns, mature cyst has only 1 nucleus, no peripheral chromatin, large karyosome with granules on one side, no visible chromatoid bodies, Prominent glycogen vacuole Infective form : cyst Vector : contaminated food or water Pathogenic/nonpathogenic/commensal : Common Disease Name : Intestinal amoebae
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Naegleria fowleri (free-living protozoan pathogen)
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