| cytotaxonomic and molecular analysis of simulium (edwardsellum) damnosum sensu lato (diptera: simuliidae) from abu hamed, sudan. | the northernmost focus for onchocerca volvulus leuckhart (nematoda: onchocercidae), the causative agent of human onchocerciasis, is found along the nile near the town of abu hamed in sudan. the vector for o. volvulus at this focus is a single monomorphic population of simulium (edwardsellum) damnosum theobald. this black fly population is limited to a small area between the fourth and fifth cataracts of the nile river that is isolated geographically from all other populations of s. damnosum sens ... | 2000 | 10916295 |