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Volume 18, Number 3—March 2012


Causes of Pneumonia Epizootics among Bighorn Sheep, Western United States, 2008–2010

Thomas E. BesserComments to Author , Margaret A. Highland, Katherine Baker, E. Frances Cassirer, Neil J. Anderson, Jennifer M. Ramsey, Kristin Mansfield, Darren L. Bruning, Peregrine Wolff, Joshua B. Smith, and Jonathan A. Jenks
Author affiliations: Washington State University, Pullman, Washington, USA (T.E. Besser, M.A. Highland, K. Baker); Washington Animal Disease Diagnostic Laboratory, Pullman (T.E. Besser); US Department of Agriculture Agricultural Research Service, Pullman (M.A. Highland); Idaho Department of Fish and Game, Lewiston, Idaho, USA (E.F. Cassirer); Montana Fish, Wildlife and Parks, Bozeman, Montana, USA (N.J. Anderson, J.M. Ramsey); Washington Department of Fish and Wildlife, Spokane Valley, Washington, USA (K. Mansfield); US Department of Agriculture Animal and Plant Health Inspection Service, Olympia, Washington, USA (D.L. Bruning); Nevada Department of Wildlife, Reno, Nevada, USA (P. Wolff); South Dakota State University, Brookings, South Dakota, USA (J.B. Smith, J.A. Jenks)

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Table 1

Bighorn sheep populations included in study of populations affected by epizootic pneumonia, western United States, 2008–2010*

Population Status† Population size % Dead or culled‡
East Fork Bitterroot, MT Pneumonic 200–220 50
Bonner, MT Pneumonic 160–180 68
Lower Rock Creek, MT Pneumonic 200 43
Anaconda, MT Pneumonic 300 50
East Humboldt/Ruby Mountains, NV Pneumonic 160–180 80
Yakima Canyon, WA Pneumonic 280 33
Spring Creek, SD Pneumonic ≈40 lambs born 95 lambs
Hells Canyon, OR and WA Pneumonic ≈170 lambs born 77 lambs
Quilomene, WA Healthy 160 2
Asotin Creek, WA Healthy 100 0

*MT, Montana; NV, Nevada; SD, South Dakota; WA, Washington; OR, Oregon.
†Pneumonic, populations with confirmed epizootic pneumonia restricted to lambs (Spring Creek and Hells Canyon) or not age restricted (all other pneumonic populations); healthy, populations with no evidence of epizootic pneumonia.
‡Estimated percentage of the population that died or was culled during the epizootic.

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