INTESTINAL AND GENITAL FLAGELLETES. Intestinal and Reproductive Track Flagellates. Giardia lamblia (pathogenic)- small intestine . Trichomonas vaginalis (pathogenic)- occurs in reproductive and urinary system of people . Trichomonas tenax - endocommensal in mouth (tooth sockets).
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INTESTINAL AND GENITAL FLAGELLETES
The parasites belonging to this group of protozoa possess one or more flagella giving them the power of motility.
These are classified according to their habitat into TWO groups:
1.Intestinal,oral & genital flagellates.
2.Blood & tissue flagllates.
Habitat: Duodenum and the upper part of the jejunum of the man.
Exits in two phases:
When viewed flat,the shape of the trophozoite is like that of badminton racket.
The dorsal surface is convex & the ventral surface is concave like a sucking disc.
The size of the trophpzoite is 14 micrometer long & 7 micrometer broad.
All organs of the body are paired. Thus there are two axostyles,two nuclei and four pairs of flagella.
In the trophozoite stage the parasites multiplies in the intestine of manby binary fission.
When conditions in the duodenum are unfavourable,encystment occurs,usually in large intestine.
During encystment the cell divides into two cyst.
Infection of man is brought by ingestion of cyst.
Within 30 min. of ingestion the cyst hatches out two trophozoites which then miltiply in enormous numbers and colonise in the duodenum.
With the help of the sucking disc the parasites attach itself on the epithelial cells of the intestine and may cause disturbance, leading to malabsorption of fat.
The patient may complain of persistent looseness of bowels , and mild steatorrhoea.
A microscopic examination of freshly passed stools for demonstration of trophpzoites and cyst.
Giardiatrophozoites may be seen in the bile.
Squamous epithelial cells
Saline: 40X objective