| 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 ... | 1992 | 1594291 |