USGS National Wildlife Health Center Quarterly Wildlife Mortality Report - January 2012 to March 2012
Avian Cholera in California (California, USA - View on GeoNames Map 
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Pasteurella multocida (avian cholera) epizootics were reported in various locations within nine California counties (Alameda, Butte, Colusa, Glenn, Sacramento, San Joaquin, Siskiyou, Sutter and Yolo) during the first quarter of 2012 (January – March).
Cases were investigated and reported by the California Department of Fish and Game in partnership with USGS National Wildlife Health Center. The smallest event involved an estimated 75 dead wood ducks on a pond in Butte County.
State waterfowl areas such as Woodbridge Ecological Reserve, Upper Butte Basin, North Grasslands, and Yolo Bypass Wildlife Areas estimated losses ranging from 200 to 1,500 birds including ducks, geese, and shorebirds.
Sutter, Stone Lake and Klamath Basin National Wildlife Refuge Complexes, which serve as wintering areas for an estimated 2 million migratory birds, estimated final mortalities ranging from 100 to over 10,000 waterfowl, shorebirds and gulls, respectively. Refuge staff and volunteers at Tule Lake/Lower Klamath Lake NWR (Klamath Basin NWR Complex) retrieved 3,908 dead birds between mid-February and late April. The staff estimates this is approximately one-third of the birds that died during the event. The species most affected were the snow goose, American coot, American wigeon, white-fronted goose and northern pintail. This was the largest outbreak of avian cholera the Klamath Basin NWR staff has seen since 2008 when an estimated 10,000 birds died due to avian cholera. [View other past avian cholera events on the Digest's Global Wildlife Disease News Map]
Source: USGS National Wildlife Health Center, Quarterly Mortality Reports
USGS National Wildlife Health Center
- Avian Cholera webpage
- Field Manual of Wildlife Disease: General Field Procedures and Diseases of Birds - Chapter 7 Avian Cholera [pdf]
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