Common Parasites

A short review of common Parasites.

Enterobius Vermicularis

1. The ova is oval and asymmetric, with one side flattened.
2. Size is 55 × 26 micrometers.

 Ascaris Lumbricoides

1. The fertile ovum is 60 x 45 micrometers. It has a thick shell and is surrounded by an albuminous covering.
2. The infertile ovum is 90 x 40 micrometers. This is surrounded by an irregular albuminous covering.

Ancylostoma Duodenal

1. Ovum measures 60 to 65 x 40 micrometers. It is oval and has a thin shell.
2. Usually, the embryo is at the four-cell stage.

 Trichuris Trichiura

1. The ovum size is 52 x  23 micrometers.
2. It is barrel-shaped with distinctive ends.

Giardia Lamblia

1. Trophozoite form measures 12 to 15 micrometer. It is pyriform and has two nuclei.
2. Trophozoite unstained shows progressive motility like a falling tree leaf.
3. Trophozoite stained shows nuclei in the area of the sucking disc.
   1. There are two median bodies posterior to the disc.
4. Cysts unstained are ovoid in shape,
   1. Stained cysts show 4 nuclei and four median bodies.

Entamoeba Histolytica

1. Entamoeba Histolytica causes chronic dysentery.

 Iodamoeba butschlii

1. Iodamoeba butschlii has variable shapes.
2. It is easily recognized in the iodine preparation.

Trichomonas vaginalis

1. It is motile due to the presence of anterior flagella.
2. The movement is rapid and jerky.

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