Parasitology. Lab. Amoeba
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1 Parasitology. Lab. Kingdom : Protista Subkingdom : Protozoa Phylum : Sacromastigophora Subphylum : Sarcodina Superclass : Rhizopoda Class : Lobosea Order : Amoebida Amoeba Protozoa Amoebae geneus Entamoeba histolytica Entamoeba dispar Entamoeba coli Entamoeba hartmanni Entamoeba gingivali Endolimax nana Iodamoeba butschlii Dientamoeba fragilis Naegleria fowler Acanthamoeba culbertsoni Natural habitat Small intestine Oral cavity Nasal Cavity,CNS Nasal Cavity,CNS 1. Entamoeba histolytica Sites of infection : Intestinal site( ) and Extraintestinal site (liver, lung, pericardium, spleen, skin, and brain. Disease : Amebiasis, Amebic dysentery, hepatic abscesses,lung abscesses, Skin amoebiasis Stages : It has four stages: Trophozoite, precyst, cyst, metacyst. Infective stage : Cyst Diagnostic stage : Motile trophozoite, precyst considered Reproduction : Asexually reproduction by Binary fission
2 Morphology Characteries Trophozoite Cyst Size range 8-86um 8-22um Shape Arregular shape spherical to round Motility Progressiv,finger-like hyaline pseudopods. Non- motility Number of nuclei One 1-4 Karyosome Samll and central Samll and central Periphral chromatin Fine and evenl distributed Fine and evenl distributed Cytoplasm Finely granular Finely granular Cytoplasminclusion Ingested RBC chromatoid bars, diffuse glycogen mass in younger cysts Laboratory Diagnosis Intestinal amoebiasis : Direct microscopic examination of the stool to recover motile trophozoite (containing red cells are diagnostic of amoebic dysentery). & charcot-leyden crystals. In extra intestinal amoebiasis : laboratory tests, including immunologically based procedures, may be used. Methods currently available include antigen tests, enzyme-linked immunosorbent assay (ELISA), indirect hemagglutination (IHA), gel diffusion precipitin (GDP), and indirect immunofluorescence (IIF).
3 Entamoeba histolytica trophozoite Entamoeba histolytica cyst.
4 2. Entamoeba coli Habitat : large intestine Disease : Intestinal amebiasis, amebic colitis, amebic dysentery, extraintestinal amebiasis. Stages : Trophozoite, cyst. Infective stage : Cyst Diagnostic stage : Trophozoites and cysts in stool. Morphology Characteries Trophozoite Cyst Size range 5-15 μm 8-35μm Shape Arregular shape Round to spherical Motility Non Progressiv, blunt Non- motility pseudopods. Number of nuclei One 1-8 Karyosome Large, irregular shape, Large, irregular shape, eccentric eccentric Periphral chromatin Unevenly distributed Unevenly distributed Cytoplasm Coarse and granulated Coarse and granulated Cytoplasminclusion Vacuoles containing bacteria often visible diffuse glycogen mass in younger cysts,thin chromatoid bars with pointed to splintered ends in young cysts Laboratory Diagnosis Stool examination is the method of choice for the recovery of E. coli trophozoites and cysts. Although not considered as being pathogenic, the presence of E. coli suggests ingestion of contaminated food or drink. Note : E. col is considered a Nonpathogen.
5 Entamoeba coli Trophozoite stage Entamoeba coli Cyst stage
6 3. Entamoeba gingivalis Habitat : Oral cavity, vaginal and cervical areas. Disease : It is nonpathogenic but opportunistic Stages : Only Trophozoite ( No cyst stage ) Infective stage : Trophozoite Diagnostic stage Trophozoite Reproduction : Asexually reproduction by Binary fission Morphology Characteries Size range Motility Number of nuclei Karyosome Peripheral chromatin Cytoplasm Trophozoite 8-20 μm Active, varying pseudopod appearance One Centrally located Fine and evenly distributed Finely granular Entamoeba gingivalis Trophozoite. Laboratory Diagnosis An accurate diagnosis of E. gingivalis trophozoites may best be made by examining mouth scrapings particularly from the gingival area. Material from the tonsillar crypts and pulmonary abscess, as well as sputum, may also be examined. Vaginal and cervical material may be examined to diagnose E. gingivalis in the vaginal and cervical areas.
7 4. Endolimax nana Habitat : Disease : considered as a nonpathogen. Stages : Trophozoite, Cyst. Infective stage : Cyst Diagnostic stage Finding the characteristic trophozoite and cyst stages in stool. Reproduction : Asexually reproduction by Binary fission Morphology Characteries Trophozoite Cyst Size range 5-12 μm 4-12 μm Shape Arregular shape Spherical, ovoid, ellipsoid Motility Sluggish, nonprogressive, blunt pseudopods. Non- motility Number of nuclei One One to four; four most common Karyosome Large, irregular, blotlike Large, blotlike, usually central Periphral chromatin Absent Absent Cytoplasm Granular and vacuolated Cytoplasm Granular and vacuolated Cytoplasm inclusion Bacteria Nondescript small mass Diffuse glycogen mass in young cysts Note : E. nana is considered a nonpathogen. A : Trophozoite stage of E. nana B : Cyst stage of E. nana
8 5. Iodamoeba bütschlii Habitat : Disease : considered as a nonpathogen. Stages : Trophozoite, Cyst. Infective stage : Cyst Diagnostic stage Finding the characteristic trophozoite and cyst stages in stool. Reproduction : Asexually reproduction by Binary fission Morphology Characteries Trophozoite Cyst Size range 8-22 μm 5-22 μm Shape Arregular shape Ovoid, ellipsoid, triangular, other shapes Motility Sluggish, usually progressive. Non- motility Number of nuclei One One Karyosome Large, usually central refractive achromatic granules may or may not be present Periphral chromatin Absent Absent Cytoplasm Cytoplasm inclusion Coarsely granular and vacuolated Bacteria Yeast cells Other debris Note : I. bütschlii is considered a nonpathogen. Large, eccentric achromatic granules on one side may be present Coarsely granular and vacuolated Well-defined glycogen mass Granules may be present A : Trophozoite stage I. bütschlii B : Cyst stage I. bütschlii
1 Trophozoite stage : The typical characteristics of this stage are :
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