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Infectious bovine keratoconjunctivitis epizootic associated with area-wide emergence of a new Moraxella bovis pilus type.
1989
Vandergaast N. | Rosenbusch R.F.
Pilus-mediated adherence is a virulence attribute of Moraxella bovis. Several pilus types have been shown to exist among strains of this bacterium, but correlation between pilus type and specific field cases of the disease has not been done. During the summer of 1987, an epizootic of infectious bovine keratoconjunctivitis was reported in 7 Iowa counties. Eight isolates of M bovis were secured from 12 episodes studied. All 8 of the isolates were nearly homogeneous in biochemical properties and had the same plasmid biotype. Pilus typing performed by immunofluorescence and immunogold electron microscopy identified a single new pilus type among 5 of the 8 isolates. This pilus type was identified in field cases that developed within a narrow time frame and over large distances. The implication of these findings is that infectious bovine keratoconjunctivitis epizootics may be associated with emergence of a novel pilus type, and that rapid dissemination over wide distances can occur, presumably by transportation of carrier cattle.
Показать больше [+] Меньше [-]Genotypic and phenotypic variation of biotypes coexisting in the Hickman strain of Newcastle disease virus.
1986
McMillan B.C. | Hanson R.P.
Virulence-associated plasmids of Yersinia species isolated from pigs and dogs in Korea
1989
Choi, W.P. (Kyongbuk National Univ., Taegu (Korea R.). Coll. of Veterinary Medicine) | Lee, H.J. (Chungnam National Univ., Taejon (Korea R.). Coll. of Agriclture) | Jung, S.C. (Rural Development Administration, Anyang (Korea R.). Veterinary Research Institute)
Nine strains of Yersinia species isolated from pigs and dogs in Korea, comprising 5 strains of Yersinia enterocolitica, 2 strains of Y. kristensenii and each strain of Y. pseudo-tuberculosis and Y. intermedia, were examined for the presence of virulence-associated plasmids, calcium dependency and provocation of guinea pig conjunctivitis (Sereny test). Three strains of Y. enterocolitica isolated from pigs were positive in calcium dependency and harbored one plasmid of about 45 megadalton, but negative in Sereny test
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