Identification Characters Of Helminths
Identification Characters of Helminths
1. Ascaris Lumbricoides (large intestinal roundworm)
*25 cm long/ smooth and unsegmented with pointed ends
*Fertilized eggs: thick chitinous shells, corticated, round or oval, 45- 60 um in diameter, with single, round, granular central mass
*Unfertilized eggs: elongated, 90 um long by 40 um wide, highly irregular surface, with large, round, very refractile granules
2. Ancylostoma Duodenale and Necator Americanus
*50-60um, oval , with rounded slightly flattened poles, thin shell that appears as a black line, with pale grey cells
3. Enterobius Vermicularis(Pinworm)
*transparent and colorless, oval but clearly asymmetrical(flattened on one side and rounded on the other), 50-60 um in size, shell is thin w/ a visible double line, with granular mass or embryonated
4. Strongloides Stercoralis (Threadworm)
*200-300 um in length and 15 um in thickness, short mouth, moderately tapered tail
5. Trichuris Trichiura (Whipworm)
*barrel shape w/ two polar plugs, with granular and yellow cell content
6. Wucheria Bancrofti (Microfilaria)
7. Fasciola Hepatica (Liver Fluke) & Fasciolopsis Busk (Intestinal Fluke)
*130 um in size, operculated and oval-shaped, thin shell, large indistinct cell w/ clear nuclei
8. Schistoma (Blood Flukes)
*have characteristic spine or minute knob
*S. mansoni: 150 um, oval w/ one rounded and one conical pole, the embryo has a sheath
*S.japonicum: 70-100um long, oval (almost round), small rudimentary spines
9. Hymenolepis Nana(Dwarf Tapeworm)
*broadly oval, 15 um in size, pale-colored and double-shelled
10. Taenia Sop.
*long segmented, ribbon-like body
*egg: spheroid-shaped, rusty brown coloured, shell is thick, single,smooth, with transverse line or striation, cell content is a round granular ,ass enclosed by a fine membrane
*has 3 pairs of hooklet
1. Ascaris Lumbricoides (large intestinal roundworm)
*25 cm long/ smooth and unsegmented with pointed ends
*Fertilized eggs: thick chitinous shells, corticated, round or oval, 45- 60 um in diameter, with single, round, granular central mass
*Unfertilized eggs: elongated, 90 um long by 40 um wide, highly irregular surface, with large, round, very refractile granules
2. Ancylostoma Duodenale and Necator Americanus
*50-60um, oval , with rounded slightly flattened poles, thin shell that appears as a black line, with pale grey cells
3. Enterobius Vermicularis(Pinworm)
*transparent and colorless, oval but clearly asymmetrical(flattened on one side and rounded on the other), 50-60 um in size, shell is thin w/ a visible double line, with granular mass or embryonated
4. Strongloides Stercoralis (Threadworm)
*200-300 um in length and 15 um in thickness, short mouth, moderately tapered tail
5. Trichuris Trichiura (Whipworm)
*barrel shape w/ two polar plugs, with granular and yellow cell content
6. Wucheria Bancrofti (Microfilaria)
7. Fasciola Hepatica (Liver Fluke) & Fasciolopsis Busk (Intestinal Fluke)
*130 um in size, operculated and oval-shaped, thin shell, large indistinct cell w/ clear nuclei
8. Schistoma (Blood Flukes)
*have characteristic spine or minute knob
*S. mansoni: 150 um, oval w/ one rounded and one conical pole, the embryo has a sheath
*S.japonicum: 70-100um long, oval (almost round), small rudimentary spines
9. Hymenolepis Nana(Dwarf Tapeworm)
*broadly oval, 15 um in size, pale-colored and double-shelled
10. Taenia Sop.
*long segmented, ribbon-like body
*egg: spheroid-shaped, rusty brown coloured, shell is thick, single,smooth, with transverse line or striation, cell content is a round granular ,ass enclosed by a fine membrane
*has 3 pairs of hooklet