| identification and phylogenetic analysis of dirofilaria ursi (nematoda: filarioidea) from wisconsin black bears (ursus americanus) and its wolbachia endosymbiont. | dirofilaria ursi is a filarial nematode of american black bears (ursus americanus pallas, 1780) that is vectored by black flies (simuliidae) in many parts of the united states. in northwestern wisconsin, the prevalence of microfilaremic bears during the fall hunting season was 21% (n = 47). unsheathed blood microfilariae from wisconsin bears possess characters consistent with the original description of d. ursi, as do adult worms observed histologically and grossly. immunohistochemistry was used ... | 2010 | 19916630 |