FEW PARASITE EGGS

Anil RegmiMedical Student

Nepalgunj Medical College

Ascaris lumbricoides

Fertilized egg

Bile stained, so brownish in colour Shape : round to oval Size : 60-70 * 40-50 micrometer Surrounded by a thick translucent shell with

an outer albuminous coat ( absence of this layer is decorticated egg

Contains very large conspicuous granule, unsegmented ovum

Crescentic area on each pole Floats on saturated solution of common salt

Fertilized egg

Decorticated egg

Unfertilized egg

Bile stained, so brownish in colour Shape : narrower and longer Size : 80 * 55 micrometer Has thinner shell with an irregular coating

of albumin Contains small atrophied ovum with a

mass disorganised, highly refractile granules of various sizes

Does not floats on saturated solution of common salt

Unfertilized egg

Hook Worm Non-bile stained, so colourless Shape : oval or elliptical Surrounded by transparent hyaline-shell

membrane Contains a segmented ovum usually with

4 blastomers floats on saturated solution of common

salt

Egg of hookworm

Trichuris trichura Bile stained, so brownish in colour Shape : barrel-shaped with projecting

mucus plug at both pole Size : 50 * 25 micrometer Has double shell Ovum: unsegmented floats on saturated solution of common

salt

Egg of trichuris trichura

Taenia sps. Bile stained, so brownish in colour Shape : round to oval Size : 33 * 43micrometer Has two membranes:

1. outer: transparent 2. inner: embryopore Embryo contains six hooklets (hexacanth

embryo)

Taenia sps.

Enterobius vermicularis Non-bile stained, so colourless Shape : asymetrical, being plano-concave

(ventral side flattened, dorsal side convex)

Size : 50-60 * 30 micrometer Has transparent shell Contains a coiled tadpole like larva floats in saturated solution of common

salt

Enterobius vermicularis

Thank you for your Patience

Its only my practice, there might be some mistakesSo please do not depend on it fully