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onchocerca ochengi: epidemiological evidence of cross-protection against onchocerca volvulus in man.in north cameroon, the vector of onchocerca volvulus (causative agent of human onchocerciasis) also transmits 2 filariae of animals: o. ochengi from cattle and o. ramachandrini from wart hogs. in order to assess the qualitative and quantitative roles of these 'animal filariae' in the epidemiology of o. volvulus, the transmission of the 3 parasites was measured in 2 villages and related to the endemicity of human onchocerciasis. in galim, a cattle-farming guinea savanna village where wild animals ...19989585937
onchocerca ochengi: assessment of the simulium vectors in north cameroon.in the savanna areas of tropical africa, cattle are frequently infected with the filaria onchocerca ochengi. this parasite is closely related to onchocerca volvulus, the causative agent of human onchocerciasis (river blindness), and is capable of developing in the same vector, simulium damnosum s.l. in north cameroon, where both o. ochengi and o. volvulus are endemic, we carried out a field study (reported in this and 2 following papers) to examine to which extent the transmission of the 2 paras ...19989585935
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 ...19911796235
age-related differences in parasitosis may indicate acquired immunity against microfilariae in cattle naturally infected with onchocerca ochengi.onchocerca ochengi is a common parasite of cattle in savanna areas of west africa and its adult stages inhabit intradermal nodules. we have exploited the accessibility of the macrofilariae to examine quantitative and qualitative differences in both the macro- and microfilariae (mff) in relation to age in naturally infected cattle. autochthonous cattle at a site on the adamawa plateau, north cameroon, situated near a perennial simulium damnosum s.l. breeding site, were examined in three age group ...19921594291
anti-onchocerca activity and phytochemical analysis of an essential oil from cyperus articulatus l.the lack of a safe and effective adult worm drug and the emergence of resistant animal parasite strains to the only recommended drug, the microfilaricide, ivermectin put many at risk of the devastating effects of the onchocerciasis. the present study was undertaken to investigate the acclaimed anti-onchocerca activity of the roots/rhizomes of cyperus articulatus in the traditional treatment of onchocerciasis in north western cameroon and to assess the plant as a new source of potential filaricid ...201424998345
molecular evidence of 'siisa form', a new genotype related to onchocerca ochengi in cattle from north cameroon.onchocerca ochengi, a filarial nematode parasite from african zebu cattle is considered to be the closest relative of onchocerca volvulus, the causative agent of river blindness. both onchocerca species share the vector, black flies of the simulium damnosum complex. correct identification of their infective third-stage larvae in man-biting vectors is crucial to distinguish the transmission of human or animal parasites. in order to identify different closely related onchocerca species we surveyed ...201323727461
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