Outbreaks in the West
Pneumonia Outbreaks Around the West
Bighorn sheep around the west regularly experience pneumonia outbreaks. State agencies decide whether to intervene or not in trying to control an outbreak of pneumonia, depending on whether the herd can easily be reached, how many sheep are sick or dying, and other factors. You can read about some of the larger outbreaks that happened in in 2012 and 2011 in the west, though there were many more outbreaks than are listed here.
AROUND THE WEST
Washington State's bighorns suffered a large outbreak of pneumonia in 2010, in the Yakima River canyon. The state euthanized about one third of the Yakima River bighorns in an attempt to stop the spread of pneumonia.
Another large outbreak occurred two years later, in April 2013. This outbreak severely reduced the Tieton herd near Naches.
MONTANA & YELLOWSTONE
In the past several years Montana has lost hundreds of bighorns to pneumonia. Watch this video about bighorn pneumonia in Montana from the Montana Fish, Wildlife, and Parks.