Onchocerca


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Onchocerca

 [ong″ko-ser´kah]
a genus of parasitic filaria. O. vol′vulus is a common parasite of humans, breeding in fast-flowing rivers and streams in tropical parts of the Americas and equatorial Africa, particularly West Africa. It is the etiologic agent of human onchocerciasis and is transmitted by the bites of blackflies (buffalo gnats) of the genus Simulium, in which the parasite passes part of its life cycle.

Onchocerca

(ong'kō-ser'kă),
A genus of elongated filariform nematodes (family Onchocercidae) that inhabit the connective tissue of their hosts, usually within firm nodules in which these parasites are coiled and entangled.
Synonym(s): Oncocerca
[G. onkos, a barb, + kerkos, tail]

Onchocerca

/On·cho·cer·ca/ (ong″ko-ser´kah) a genus of nematode parasites of the superfamily Filarioidea, including O. vol´vulus, which causes onchocerciasis.

Onchocerca

[ong′kōsər′kə]
Etymology: Gk, onkos, tumor + kerkos, tail
a genus of nematode parasites of the superfamily Filarioidea that infects humans and ruminants. The adults live and breed in subcutaneous fibroid nodules. The young (the microfilariae) are carried by the lymph and are found chiefly in the skin, subcutaneous connective tissues, and eyes. O. volvulus is a common parasite of humans that breeds in fast-flowing rivers and streams in tropical regions of the Americas and Africa, particularly West Africa. It is the cause of human onchocerciasis and is transmitted by the bites of buffalo gnats.

On·cho·cer·ca

(ong'kō-ser'kă)
A genus of elongated filariform nematodes that inhabit host's connective tissue, usually within firm nodules in which these parasites are coiled and entangled.
Synonym(s): Oncocerca.
[G. onkos, a barb, + kerkos, tail]

Onchocerca

a genus of nematode parasites in the family Onchocercidae. They are important as causes of onchocercosis. Their life cycles depend on the carriage of larval microfilariae by a variety of insects, chiefly mosquitoes, black flies and midges (families Simuliidae and Ceratopogonidae). The microfilariae are found in the lymph and connective tissue spaces of the skin. Called also Wehrdikmansia.

Onchocerca armillata
the microfilariae are found in the skin of the hump, withers, neck, dewlap and umbilicus and the adults in the aorta of cattle, buffalo, sheep, goats and donkeys.
Onchocerca bohmi
see elaeophorabohmi.
Onchocerca cebei
found in nodules on the brisket and the lateral aspects of the hindlimbs of buffalo. Called also O. sweetae.
Onchocerca cervicalis
found in the ligamentum nuchae of the horse and mule. The microfilariae are commonest in the area of the linea alba. Etiologically related to the occurrence of fistulous withers, poll evil, equine conjunctivitis and possibly equine recurrent ophthalmitis.
Onchocerca cervipedis
found in the subcutaneous tissues of the neck and limbs of deer.
Onchocerca dukei
adults are found in nodules in subcutaneous and perimuscular sites in cattle, mostly in the thorax, abdomen, diaphragm and thighs.
Onchocerca flexuosa
occurs in deer.
Onchocerca garmsi
parasites of deer.
Onchocerca gibsoni
found in nodules under the skin of the brisket or the lateral aspect of the hindlimbs of Bos taurus and Bos indicus cattle.
Onchocerca gutturosa
found in cattle and buffalo in the ligamentum nuchae, on the scapular cartilage and in the hip, shoulder and stifle areas.
Onchocerca lienalis
found in the gastrosplenic ligament, on the capsule of the spleen and above the xiphisternum in cattle.
Onchocerca ochengi
found in cattle, in nodules in cutaneous and subcutaneous sites on the udder, scrotum and flanks.
Onchocerca raillieti
adult worms are found in the ligamentum nuchae, in subcutaneous cysts on the penis and in perimuscular connective tissue of donkeys.
Onchocerca reticulata
a parasite of horses, mules and donkeys. Adult worms are found in the connective tissue of flexor tendons and suspensory ligament of the fetlock, mostly in the forelimb.
Onchocerca rugosicauda
found in the subcutaneous fascia in the shoulders and back of roe deer.
Onchocerca sweetae
see O. cebei (above).
Onchocerca synceri
found in subcutaneous tissues in African buffalo.
Onchocerca tarsicola
a parasite of deer.
Onchocerca tubingensis
a parasite of deer.
Onchocerca volvulus
causes dermatitis and ocular disease in humans.
References in periodicals archive ?
Among the parasites, Stephanofilaria species, Onchocerca species, Rhabditis species and Railletia auris were obtained from 32.
A Oncocercose, tambem conhecida como cegueira dos rios e ocasionada pela microfilaria Onchocerca volvulus Leuckart, 1893 (REY, 1991).
1) With a much broader distribution range, Onchocerca volvulus is transmitted by Simulium species black flies and causes onchocerciasis with chronic skin and eye infections in about 37 million people in endemic areas of Mexico, Central and South America, West and Central Africa, and the Arabian Peninsula (Yemen).
A computational analysis of the binding mode of closantel as inhibitor of the Onchocerca volvulus chitinase: Insights on macrofilaricidal drug design.
Onchocerciasis, also known as River Blindness, is a parasitic disease caused by the nematode Onchocerca volvulus and transmitted by black flies of the genus Simulium.
Polymerase chain reaction monitoring of transmission of Onchocerca volvulus in two endemic states in Mexico.
Onchocerciasis (river blindness) is caused by the parasitic worm Onchocerca volvulus, transmitted to humans by the bite of infected black flies of the genus Simulium, and is characterized by chronic skin disease, severe itching, and eye lesions that can progress to complete blindness.
Eight filarial species are known to infect humans out of which most serious filarial infections are caused mostly by four parasites like Wuchereria bancrofti, Brugia malayi, Onchocerca volvulus and Loa loa.
Transmission of Onchocerca volvulus by Simulium albivirguatum in the endemic area for onchocercosis of the central basin, Zaire.
Nematode species infecting the skin include Gnathostoma and the filarial species, Loa loa, Onchocerca volvulus, Mansonella streptocerca and Dirofilaria spp [3].
Diptera:Simuliidae), an important Neotropical vector of Onchocerca volvulus.
Indeed, fragments of Wolbachia DNA appear to be present in noncoding regions of the filarial nematodes Onchocerca volvillus, 0.