Chilomastix mesnili
Chilomastix mesnili (Nonpathogen)
This organism belongs to the flagellates, is a nonpathogen, and causes no disease. Both the trophozoite (usual size, 6-24 µm long and 4-8 µm wide) and cyst forms (usual size, 6-10 µm long and 4-6 µm wide) can be found in clinical specimens.
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Trophozoites |
Cyst in iodine |
Cyst, permanent stain |
Life Cycle:
Intestine, organisms passed in feces
Acquired:
Fecal-oral transmission via cyst form; contaminated food and water
Epidemiology:
Worldwide, primarily human-to-human transmission
Clinical Features:
None.
Clinical Specimen:
Intestinal: Stool
Laboratory Diagnosis:
Intestinal: Ova and Parasite examination (concentration, permanent stained smear)
Organism Description:
Trophozoite: Pear shaped, 1 nucleus and distinct oral groove (cytostome); flagella are rarely seen without special stains.
Cyst: Pear or lemon shaped, will contain 1 nucleus; the cytostomal fibril is curved and is called the “shepherd’s Crook”.
Laboratory Report:
Chilomastix mesnili (indicate trophozoites and/or cysts)
Treatment:
None
Control:
Improved hygiene, adequate disposal of fecal waste, adequate washing of contaminated fruits and vegetables
Comments:
Small organisms can mimic other small protozoa.
