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  • Title: Pasteurella spp. in sympatric bighorn and domestic sheep.
    Author: Ward AC, Hunter DL, Jaworski MD, Benolkin PJ, Dobel MP, Jeffress JB, Tanner GA.
    Journal: J Wildl Dis; 1997 Jul; 33(3):544-57. PubMed ID: 9249701.
    Abstract:
    Domestic sheep were sighted at different times from 1991 to 1993 on four Nevada (USA) ranges occupied by bighorn sheep. Nasal and pharyngeal swab samples were collected from both sheep species and cultured to determine if any strains of Pasteurella spp. were shared on range conditions after contact of the two species. Pasteurella spp. were isolated from all 38 bighorn sheep and 16 of 17 domestic sheep included in this study. The isolates were characterized on the bases of species, biotype, serotype, biogroup, and restriction enzyme analyses (REA) as well as ribotyping of bacterial DNA. A P. haemolytica biotype 3, biogroup 11 isolate from a domestic sheep had biochemical, REA, and ribotype profiles which were identical to those of isolates from three bighorn sheep on the same range. None of the other isolates were found to be common to the two sheep species. Disease was not detected in any of the bighorn populations. However, bighorn sheep populations were extirpated on two ranges while increasing on the other two, including the range on which P. haemolytica biotype 3, biogroup 11 strain was isolated. Declining sheep numbers were not correlated with the presence of any one strain of Pasteurella spp from the sheep.
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