Lab.7.pdf

Practical parasitology Metazoa Nematodes Second stage Lab:7 Trichuris trichiura (whip worm) Whipworm Soil transmitted helminth Often observed occuring together with Ascaris lumbricoides due to similarities in transmission and mod...

Practical parasitology Metazoa Nematodes Second stage Lab:7 Trichuris trichiura (whip worm) Whipworm Soil transmitted helminth Often observed occuring together with Ascaris lumbricoides due to similarities in transmission and mode of distribution. Cause Trichuriasis Morphology: Inhabit the large intestine Insert into the intestinal wall of the cecum in a pin- fashion the worm looks like a buggy whip, the anterior 3/5 is slender and the posterior 2/5 is thick. The male is smaller than the female. Ova: It is barrel or spindle in shape and 50 x 20µm in size. It is brownish in color. Bipolar mucus plugs at either ends Football in shape Embroyanation in the soil (2-3 weeks) Diagnosis: Direct fecal smear Ancylostoma duodenale (Hookworms) The hookworms cause hookworm disease. At least two species of hookworms infect man, Necator americanus and Ancylostoma duodenale. They live in small intestine. Ancylostoma duodenale causes Ancylostomiasis  Morphology: Adults: They look like an odd piece thread and are about 1cm. They are white or light pinkish when living. ♀is slightly larger than♂. The male’s posterior end is expanded to form a copulatory bursa. Shape: single curve, looks like C. Eggs: Oval in shape, 60×40 µm in size, shell is thin and colorless. Content is 2-8 cells.  Ancylostoma duodenale - copulatory bursa and spines of male(a side view) Egg filariform larva Hookworm Life Cycle Adults of Ancylostoma duodenale in intestinal mucosa  Diagnosis: Hemoglobin is lower than 120g/L in man, 110g/L in woman. Find hookworm egg, direct fecal smear