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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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Page created: February 16, 2012
Page updated: February 16, 2012
Page reviewed: February 16, 2012
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.