5 Intestinal Protozoa
5 Intestinal Protozoa
5 Intestinal Protozoa
Scientific name Entamoeba histolytica Entamoeba coli Endolimax nana Chilomastix mesnili Giardia lamblia Trichomonas vaginalis Balantidium coli
Diagnostic stage trophozoite, cyst trophozoite, cyst trophozoite, cyst trophozoite, cyst trophozoite, cyst trophozoite cyst
Infective stage cyst trophozoite, cyst trophozoite, cyst cyst cyst trophozoite cyst
Size range 10-60 μm 12-50 μm 6-15 μm 6-24 μm 10-20 μm 0-30 50-70 μm
Shape elongated elongated ovoidal and irregular shaped pear-shaped teardrop-shaped ovoid or pear-shaped ovoid; sac-shaped
# of nuclei 1 1 1 1 2 1 2; 1 macro and 1 micro
1; large and eccentric; blot- 1; small and central or
Endosome 1; small and central 1; large and eccentric 2; large and central
like eccenric
Peripheral fine and evenly or cogwheel coarse and unevenly
Trophozoite
lack of peripheral chromatin lack of peripheral chromatin lack of peripheral chromatin evenly distibuted
chromatin distributed distributed
clear ectoplasm with finely
Cytoplasm granular endoplasm; ground coarsely granular granular; vacuolated granular
glass appearance
2 contactile vacuoles; small
2 median bodies; 2
prominent cytostome in funnel-shaped; cytostome;
Inclusions or axostyles. 2 large suction undulating membrane;
RBCs bacteria bacteria 1/3-1/2 length of body; bacteria; has a tapering
other features disks from anterior; 2 prominent axostyle
spiral groove anterior end; largest
parabasal or median bodies
protozoa in humans
Size range 10-20 μm 10-33 μm 5-10 μm 6-10 μm 8-19 μm 45-65 μm
Shape spherical spherical oval lemon-shaped oval spherical
# of nuclei 4 8 4 1 4 2; 1 macro and 1 micro
Endosome 1; small and central 1; large and eccentric 1; large and central; blot-like 1; large and central 4; large and central
Peripheral fine and evenly or cogwheel coarse and unevenly
Cyst
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