Twenty-eight isolates of Pasteurella haemolytica from domestic sheep (n = 14 isolates) and bighorn sheep (n = 14 isolates) were evaluated for leucotoxicity against peripheral blood neutrophils of bighorn sheep by adding bacterial culture supernatants to bighorn sheep neutrophils in vitro. Leukotoxic isolates of P. haemolytica, defined as causing >50% neutrophil death as measured by release of lactate dehydrogenase into culture supernatants, were identified from eight of 14 domestic sheep isolates and from 0 of 14 bighorn sheep isolates. The in vitro assay of isolates of P. haemolytica may provide a valid predictive measure of strain virulence of P. haemolytica, and of potential pneumonic episodes in bighorn sheep populations.
COMPARATIVE LEUKOTOXICITIES OF PASTEURELLA HAEMOLYTICA ISOLATES FROM DOMESTIC SHEEP AND FREE-RANGING BIGHORN SHEEP (OVIS CANADENSIS)
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Steven J. Sweeney, Ronald M. Silflow, William J. Foreyt; COMPARATIVE LEUKOTOXICITIES OF PASTEURELLA HAEMOLYTICA ISOLATES FROM DOMESTIC SHEEP AND FREE-RANGING BIGHORN SHEEP (OVIS CANADENSIS). J Wildl Dis 1 October 1994; 30 (4): 523–528. doi: https://doi.org/10.7589/0090-3558-30.4.523
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