parasitology protazoa for ospe
TRANSCRIPT
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PARASITOLOGY
Protazoa
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JMJ
O Great St. Joseph of Cupertino who while on earth
did obtain from God the grace to be asked at your
examination only the questions you knew, obtain for
me a like favors in the examinations for which I am
now preparing. In return I promise to make you
known and cause you to be invoked.
Through Christ our Lord.
St. Joseph of Cupertino, Pray for us.
Amen.
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Entamoeba coli - Tropozoite
• Unicellular.
• No definite shape. single nucleus.
• Demarcation between ectoplasm & endoplasm is not very clear, ectoplasm is only a thin rim of cytoplasm.
• Pseudopodia are broader & blunter (usually granular).
• Endoplasm coarsely granular, usually contains ingested Bacteria – numerous vacuoles (No RBC ).
• Karyosome large, eccentrically located inside the nucleus.
• Nuclear membrane is thick, lined irregularly with coarse granules of chromatin.
• Size range 15-50 μm
• (Fresh specimen will show sluggish movement ).
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Entamoeba coli - Tropozoite
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Entamoeba coli - Tropozoite
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Entamoeba histolytica - Tropozoite
• Unicellular.
• No definite shape.
• Single nucleus.
• Cytoplasm is divided into - clear hyaline -ectoplasm. finely granular -endoplasm.
• Thin finger like ectoplasmic pseudopodia.
• Endoplasm usually contains ingested RBC(Reddish yellow or Yellowish green in saline preparation), No Bacteria.
• Karyosome is small dot like, central in position and surrounded by a clear halo inside the nucleus.
• Nuclear membrane is delicate, lined regularly with single layer of fine granules of chromatin.
• Size range 15-60 μm.
• (Fresh specimen will show characteristic active progressive movement in definite direction).
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Entamoeba histolytica - Tropozoite
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Entamoeba histolytica - Tropozoite
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Entamoeba coli - Cyst • Round in shape.
• Surrounded by a highly refractile membrane -Cyst wall.
• Mature cysts contain EIGHT (8) nuclei.
• Cytoplasm is clear & hyaline.
• Nuclei retain characteristics of trophozoite nuclei (Coarse chromatin granules, Eccentric karyosome ).
• Chromatoid bodies if present are in the form of slender filaments or pointed threads.
• Glycogen vacuole large, diffuse, visible in binucleate stage (Not found in mature cyst ).
• Size range 15-20 μm (Larger compared to E.histolytica)
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Entamoeba coli - Cyst
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Entamoeba coli - Cyst
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Entamoeba histolytica - Cyst • Round in shape.
• Surrounded by a highly refractile membrane -Cyst wall .
• Mature cyst contains FOUR (4) nuclei.
• Cytoplasm clear & hyaline.
• Nuclei retain characteristics of trophozoite nuclei (Fine chromatin granules, Central karyosome).
• Chromatoid bars are seen as refractile rods with rounded ends (sausage shape ) in normal saline.(Stains Black with iron haematoxylin, Do not stain with iodine.)
• Glycogen vacuole diffuse, stains mahogony brown with iodine (visible in uninucleate stage ).
• Size range 10-15 μ (smaller compared to E.coli ).
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Entamoeba histolytica - Cyst
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Entamoeba histolytica - Cyst
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Giardia intestinalis -Trophozoite (Giardia lamblia / duodenalis)
• Size :
• 10-18μm (size of 2 RBC s)
• Shape :
• Bilaterally symmetrical.
• Front view -pear shaped, broad anterior & tapering posterior end.
• Side view - spoon shaped.
• Content :
• An ovoid, concave sucking disc (occupies 3/4th of ventral surface.)
• 2 nuclei with large central karyosomes.
• 2 axonemes.
• 2 blepharoplasts.
• 2 parabasal bodies ( deeply staining ).
• 4 pairs of flagella.
• ( No undulating membrane or axosytle ).
• Motility :
• Moves forward with rapid, jerky , twisting motion. (seen in fresh specimen)
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Giardia intestinalis -Trophozoite (Giardia lamblia / duodenalis)
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Giardia intestinalis -Trophozoite (Giardia lamblia / duodenalis)
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Giardia intestinalis -Trophozoite (Giardia lamblia / duodenalis)
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Giardia lamblia- Cyst • Size : 8-10 μm.
• Shape : Oval, one pole more rounded than the other.
• Shell : Smooth, well defined wall (appears to be double walled but the second wall is the membrane of the cytoplasm)..
• Nuclei : Two (2) to Four (4) in number.Very fine nuclear membrane.. Karyosome small, central, faintly coloured.
• Cytoplasm : Clear, refractile, contains many of the structures of the trophozoite.
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Giardia lamblia- Cyst
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Trycomonas vaginalis - tropozoite
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Trycomonas vaginalis - tropozoite
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Trycomonas vaginalis - tropozoite
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• Size : • 27 x 18um.
• Shape : • Pear shaped.
• Nucleus : • Prominent, spherical, at the anterior end.
• Flagellae : • Five(5) in number, Four (4) anterior flagellae and one (1) posterior flagellum which
extends posteriorly along the undulating membrane.
• Axostyle : • Runs down the middle of the body.
• Undulating membrane: • Conspicuous, extends along approximately
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Toxoplasma gondii / Pseudocyst & released Endozoites/Tachyzoites
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P- Pseudocyst E – Endozoites W- White cells
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Toxoplasma gondii / life cycle
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P- Pseudocyst E – Endozoites W- White cells
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