| the development of onchocerca dukei and o. ochengi microfilariae to infective-stage larvae in simulium damnosum s.l. and in members of the s. medusaeforme group, following intra-thoracic injection. | neonate simulium females from an endemic area of human and bovine onchocerciasis in north-cameroon were injected in one set of experiments with microfilariae (mff) of onchocerca dukei and in another with mff of o. ochengi. onchocerca dukei was found to develop to infective third-stage larvae in simulium flies: 148 third-stage larvae (28.1% of injected mff) were recovered in s. hargreavesi, seven (10.4% of injected mff) in s. vorax, and 12 (1.3%) in s. damnosum s.l. onchocerca ochengi mff develop ... | 1991 | 1746982 |
| transmission of onchocerca dukei by simulium bovis in north-cameroon. | "wild" simulium bovis females were collected after they had taken blood on a bait oxen with skin microfilariae (mf) of onchocerca dukei and onchocerca ochengi. flies ingested o. dukei mf in high numbers (13.1 mf per blood fed fly) but rarely mf of o. ochengi (3 mf in 60 flies). in 32 flies dissected 14 to 17 hours after the blood meal, a total of 130 o. dukei mf but no of o. ochengi had migrated to the thorax. six to 9 days after the blood meal, a total of 203 third stage larvae (l3) were found ... | 1991 | 1796235 |
| chromosome numbers in onchocerca dukei and o. tarsicola. | testicular examination of male onchocerca dukei and german o. tarsicola revealed five pairs of chromosomes, which is typical of most filariae. in contrast to german o. tarsicola, specimens from sweden had only three pairs of chromosomes. | 1991 | 1940251 |
| [subcutaneous nodules and cutaneous lesions caused by different onchocerca in african cattle]. | subcutaneous nodules and skin biopsy specimens obtained from the umbilical area of 6 onchocercal bos indicus were collected in cameroon and subjected to a histological examination. the nodules containing onchocerca ochengi and onchocerca dukei showed the same structure as onchocerca volvulus nodules in man; they consisted of inflammatory pseudo-cysts often containing a female filaria. these pseudo-cysts were classified as "young", "active" and "old" depending on the inflammatory cellular compone ... | 1994 | 7991898 |
| onchocerca armillata contains the endosymbiotic bacterium wolbachia and elicits a limited inflammatory response. | human onchocerciasis, also known as river blindness, is a debilitating disease caused by the filarial nematode onchocerca volvulus. many, but not all, filarial nematodes carry within their tissues endosymbiotic, rickettsia-like bacteria of the genus wolbachia. onchocerca spp. infections in cattle offer the most relevant, analogous host-parasite model system. west african cattle are commonly co-infected with four onchocerca spp.; two of these are wolbachia-positive (onchocerca gutturosa and oncho ... | 2010 | 20850932 |