What is the morphology of Wuchereria bancrofti?
Morphology. As a dioecious worm, W. bancrofti exhibits sexual dimorphism. The adult worm is long, cylindrical, slender, and smooth with rounded ends.
What is microfilaria of Wuchereria bancrofti?
The microfilariae of Wuchereria bancrofti are sheathed and measure 240—300 µm in stained blood smears and 275—320 µm in 2% formalin. They have a gently curved body, and a tail that is tapered to a point.
What are the characteristics of Wuchereria bancrofti?
CHARACTERISTICS: Wuchereria bancrofti is a filarial nematode that, as an adult, is a thread-like worm(1,2,3). The female nematodes are 10 cm long and 0.2 mm wide, while the males are only about 4 cm long(1,3).
What is the morphology of loa loa?
Loa loa is cylindrical, has a cuticle with three main outer layers made of collagen and other compounds. The outer layers are non-cellular and are secreted by the epidermis. The cuticle layer protects the nematodes so they can invade the digestive tracts of animals.
What is the classification of Wuchereria bancrofti?
Wuchereria bancrofti (Cobbold, 1877)…
| Wuchereria | |
|---|---|
| Phylum: | Nematoda |
| Class: | Chromadorea |
| Order: | Rhabditida |
| Family: | Onchocercidae |
What is the morphology of Loa loa?
What technique can be used to differentiate among species of microfilaria?
The modified Knott’s method is used for the concentration and identification of microfilariae, specifically the heartworm Dirofilaria immitis. It must be differentiated from the non-pathogenic microfilaria of Dipetalonema reconditum (“Dipet” for short).
How will you distinguish microfilariae of Wuchereria bancrofti from that of Brugia malayi?
The lateral caudal papillae in B. malayi have an indentation around their bases which is absent in W. bancrofti. This is the most useful distinguishing feature and easily recognizable.
Is Loa loa a microfilariae?
Loa loa microfilaria found in blood film. L. loa is one of three parasitic filarial nematodes that cause subcutaneous filariasis in humans. The other two are Mansonella streptocerca and Onchocerca volvulus (causes river blindness).
What are the diagnostic features of Loa loa?
Diagnostic Findings Loa loa is usually diagnosed by the finding of microfilaria in peripheral blood smears or adults in the subconjunctiva. The blood films may be thick or thin and stained with Giemsa or hematoxylin-and-eosin. For increased sensitivity, concentration techniques can be used.
How do you find microfilaria under a microscope?
Fill a microhematocrit tube and spin down as if doing a pcv. Lay the tube on a slide and put it on the microscope stage. Focus in on the buffy coat on 10x power – if a dog is heartworm positive and has circulating microfilaria, you can see the microfilaria squirming around in the buffy coat!
What are the characteristics of Brugia malayi?
Long and threadlike, B. malayi and other nematode possess only longitudinal muscles and move in an S-shape motion. Adults are typically smaller than adult W. bancrofti, though few adults have been isolated. Female adult worms (50 mm) are larger than male worms (25 mm).
How are the microfilariae of Mansonella Ozzardi differentiated from those of Onchocerca volvulus?
Microfilariae of Mansonella streptocerca are unsheathed and measure 180—240 µm by 3—5 µm. The tail is bent into a hook-like shape and the nuclei extend to the end of the tail. Microfilariae are found in skin and do not circulate in the blood, and should be distinguished from those of Onchocerca volvulus.
What is microfilaria in biology?
The microfilaria (plural microfilariae, sometimes abbreviated mf) is an early stage in the life cycle of certain parasitic nematodes in the family Onchocercidae. In these species, the adults live in a tissue or the circulatory system of vertebrates (the “definitive hosts”).
Is microfilaria of Wuchereria bancrofti morphologically different in cytological smears?
Objective: Microfilaria of Wuchereria bancrofti has been described in many cytological specimens, where typical blood film morphology has been used for evaluation. However, these studies have not documented the morphological variations in microfilaria in cytological smears.
What is the life cycle of Wuchereria bancrofti?
Wuchereria bancrofti is a digenetic endoparasite, and complete life cycle in man, the definite host and mosquito (Culex & Aedes), intermediate host. Microfilaria is sucked from peripheral blood of man. The sheath of microfilaria digests in the stomach of mosquito. Then larvae penetrate stomach wall and reach thoracic and wing muscles.
How are microfilariae characterized in Brugia malayi?
Results: All microfilariae were characterized as W. bancrofti and showed a wide variation in their length (202 to 300 µm) and width (6.2 to 8.4 µm). Terminal and subterminal swellings were seen in one of the cases causing diagnostic confusion with Brugia malayi.
What are the characteristics of filarial worm?
The filarial worm is a dreaded human parasite. The adult worm lives coiled up in the lymph glands and lymph passages of man. Adult female averages 82 mm long and 0.25 mm wide,. The male is smaller, average 40 mm in length by 0.1 mm in width. The head end is slightly enlarged. The mouth is a simple hole without lips.