Mansonella ozzardi
| Mansonella ozzardi | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Nematoda |
| Class: | Secernentea |
| Order: | Spirurida |
| Family: | Onchocercidae |
| Genus: | Mansonella |
| Species: | M. ozzardi |
Mansonella ozzardi is a parasite in the phylum of Nematoda. This filarial nematode is one of two that causes serous cavity filariasis in humans. The other filarial nematode that causes it in humans is Mansonella perstans. M. ozzardi is an endoparasite that inhabits the serous cavity of the abdomen in the human host. It lives within the mesenteries, peritoneum, and in the subcutaneous tissue.
Like other nematodes, M. ozzardi is a cylindrical and bilaterally symmetrical worm, with a pseudocoel, or a false body cavity. The exterior of the parasite, the cuticle, is a protective layer that can withstand the harsh environment in the digestive tracts of the human hosts.
M. ozzardi and other nematodes have longitudinal muscles that run along the body wall. They also have dorsal, ventral, and longitudinal nerve cords connected to these longitudinal muscles.
In the adult stages of M. ozzardi, the females are larger than the males.
This is a dioecious species; the female is believed to release a pheromone to attract males. When the male finds the female, he will coil around the female over the genital pore. The male's spicules are used to hold the female during copulation. The females are ovoviviparous. The sperm of a nematode lacks a flagellum. Its motility is due to its amoeboid-type cell.
This is a New World parasite. It is prominent in the subtropical, tropical, and temperate regions of Central and South America (Mexico, Panama, Brazil, Colombia, and Argentina), and the Caribbean. The prevalence of M. ozzardi in Brazil is very high; about 44-52% of Brazilian farmers are infected. It is also prevalent with the American Indian population.
M. ozzardi is transmitted by two types of arthropods that feed on the blood of humans: biting midges (genus Culicoides) and blackflies (genus Simulium). In the Caribbean, M. ozzardi uses the biting midge as its intermediate host. The black fly serves as the intermediate host for the filariae parasite in the Amazon Basin and mainland South America.
The biting midges are small flies that breed on sandy beaches near the sea. Some species also lay their eggs on decaying leaf litter, humus, manure, and partially rotten vegetation, in tree holes, and the cut stumps of banana trees. They feed on the blood of mammals, birds, reptiles, and humans. Their short mouthparts prohibit them from biting through clothing. As a result, they prefer to feed on the head or other exposed body parts. Blood meals occur throughout the day and night, but biting activity peaks during the early evening. Since individual bites can be painful, they are a cause of concern because they tend to attack in swarms of hundreds or thousands. Due to their small size, they can pass through mesh mosquito nets.
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Wikipedia