| onchocerciasis in british cattle: a study of onchocerca gutturosa and o. lienalis in north wales. | onchocerca gutturosa and o. lienalis infections in british cattle were studied by examination of cattle post-mortem originating from north wales and cheshire (north west england). in 463 adult animals, the microfilarial (mf) prevalence was 28.5%. in 95.3% of the mf infected animals, gravid worms could not be found at either the ligamentum nuchae or the gastro-splenic omentum. dermal mf at the head were identified as o. gutturosa on the basis of their highly significant association with the prese ... | 1987 | 2440940 |