Volume 18, Number 3—March 2012
Causes of Pneumonia Epizootics among Bighorn Sheep, Western United States, 2008–2010
|Population||Status†||Population size||% Dead or culled‡|
|East Fork Bitterroot, MT||Pneumonic||200–220||50|
|Lower Rock Creek, MT||Pneumonic||200||43|
|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|
|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.