Faecal Sample Flashcards
55 microns
Oval
Colourless, clear shell
Slightly flattened on on side
Enterobius
50-55 microns
Brown
Barrel Shaped
Mucoid plug at either end
Trichruris
85-90 microns
Flattened, truncated ends
Thinner shell, mammillated layer more variable
Unfertale eggs contain mainly a mass of refractile granules
Unfertalised ascaris
55-65 microns
Yellow Brown in colour
Round or oval
Ovum surrounded by uneven albuminous coat
Fertile Ascaris
25 to 30 microns in length
Flask Shaped
Yellow-brown
Operculum easily seen because of prominent shoulders
Small knob may be seen at opposite end of operculum.
Opisthorchis
35-45 microns in length
Yellow brown
Round
Thick radially striated wall surrounding embryo
Three pairs of embryo hooklets
Taenia
35-45 microns
Colourless
Oval or round
Contains and embryo
Up to three pairs of hooklets visible
Threadlike polar filaments may be seen at each end of the egg
Hymenolepis nana
55-65 microns in length
Colourless, decorticated so no albumin coat and not bile stained.
Decorticate ascaris
60-70 microns
Oval or elliptoid in shape, colourless
Thin shell appears as a black line
Segmented ovum
Hookworm
65-70 microns
Pale yellow brown
Oval in shape
Operculum at one end
Mass of granulated yolk cells surrounding undeveloped ovum
More oval in shape than other species
68-100 microns by 45-80 microns in dimension.
Vestigial spine (smaller and less conspicuous than other species)
Schistosoma japonicum
Yellow Brown
Oval shape with one end often slightly flattened
70-95 microns
Operculum easily seen because of “shoulders”
Egg contains unsegmented ovum and mass of yolk cells
Paragonimus Westermani
110-140 microns
Pale yellow or colourless
Prominent terminal spine
Miracidium
Schistosoma haematobium
120-140 microns
Pale yellow/brown colour
Clear prominent lateral spine near posterior end
Anterior end is tapered and slightly curved
Schistosoma mansoni
120-140 microns
Oval
Contains yolk cells
Yellow/brown in colour
Operculum at one end
Fasciola
10-15 microns
Circular
4 nuclei
Chromatid body
Entamoeba histolytica/E. dispar
10-15 microns
10-15 microns
Oval shape
Axostyle present
Giardia cyst
15-25 microns
Circular shape
Mature cysts typically have 8 nuclei but may have as many as 16 or more. (Entamoeba coli is the only Entamoeba species found in humans that has more than four nuclei in the cyst stage)
E.coli
7-9 microns
In iodine
Spherical to elliptoid in shape
Mature cysts have four small nuclei with large, usually centrally located karyosomes and no peripheral chromatin. Nuclei are not visible in unstained wet mount.
Endolimax nana.
7-9 microns
In Iodine
9-15 microns
Nearly spherical to elliptoid in shape
Single nucleus not visible on wet mount or iodine
In this cyst, the glycogen vacuole can be seen as a large, oval refractile body.
Iodamoeba Buetchlii
8-15 microns
Spherical to oval vacuolar forms
50-70 microns
Circular
Thick cyst wall
Contractile vacuoles
Balantidium coli
