title: Re-investigations of selected bovine and ovine strains previously classified as Pasteurella haemolytica and description of some new taxa within the Pasteurella haemolytica-complex.
abstract: The taxonomic relationship of 116 isolates of Pasteurella haemolytica was re-investigated by conventional phenotypic characterization. Seventy-nine characters were examined. Ninety strains were classified with previously described biovars of P. haemolytica. The remaining strains made up at least six new biogroups within the P. haemolytica-complex. "Key-characters" separating these groups included ornithine, L(+)arabinose, D(-)sorbitol, cellobiose, beta-glucosidase, glycosides and alpha-fucosidase. The taxonomic significance of these characters is uncertain. Determinations of genome size, mol% G + C in DNA and DNA:DNA hybridizations are in progress to obtain further information on the taxonomic significance of the present findings.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D004269:DNA, Bacterial / Q000032:analysis; D005798:Genes, Bacterial; D006801:Humans; D009693:Nucleic Acid Hybridization; D010325:Pasteurella / Q000145:classification* / Q000235:genetics; D010326:Pasteurella Infections / Q000382:microbiology / Q000662:veterinary*; D010641:Phenotype; D011014:Pneumonia / Q000382:microbiology / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000382:microbiology*
chemical_list: D004269:DNA, Bacterial