Home » State » Washington Bird flu strikes 4th Washington flock, spreads to hawks
Published: February 4, 2015 10:39AM
New cases of a avian influenza cases continue to break out, this time in north-central Washington. Highly pathogenic avian influenza has swept through another mixed-bird backyard flock in Washington. Meanwhile, authorities have confirmed the virus is afflicting native raptors. The Washington State Department of Agriculture on Monday established a quarantine zone 6 miles around where about 100 birds, raised primarily as a youth project, were infected in Okanogan County near the Canada border. The virus rapidly killed about half of the birds before tests confirmed Saturday that they were avian flu victims. The surviving birds will be euthanized, according to WSDA. The flock was in Oroville, about 40 miles from where 5,000 game birds were infected last week in Riverside. In that case, the virus killed 40 pheasants and 12 turkeys before it was confirmed. The surviving game birds were euthanized Tuesday. The U.S. Department of Agriculture has yet to identify the specific bird flu strain in either case, though officials have determined the virus was highly pathogenic. State Veterinarian Joe Baker said there was no known connection between the game bird farm and the backyard flock. “Right now, we have to chalk it up to coincidence,” he said. Baker said no commercial poultry farms are inside the quarantine zone. The Oroville flock is the fourth non-commercial batch of birds to be struck by avian influenza in Washington state since early January. Two flocks were in Benton County in south-central Washington, while the other flock was in Clallam County on the Olympic Peninsula. Single non-commercial flocks in Oregon and Idaho also have been infected. Baker said the Oroville flock, like the others, was likely infected by migratory waterfowl, which carry avian influenza but are immune to the virus. The virus has been found in migrating ducks in six states and at commercial poultry farms in British Columbia, Canada, and California. In the first cases involving raptors, the USDA has confirmed a Cooper’s hawk in Whatcom County and a red-tailed hawk in Skagit County tested positive for highly pathogenic H5N2 bird flu. The virus is a mixed of Eurasian and North American avian influenza strains. Tests are pending on at least two other raptors collected in Washington — a red-tailed hawk from Benton County and a peregrine falcon from Grays Harbor County. Washington State Department of Fish and Wildlife veterinarian Kristin Mansfield said raptors don’t pose the same threat as migratory waterfowl as spreaders of the virus. A raptor with bird flu doesn’t survive long, she said. “It kills them pretty quick.” The Department of Fish and Game collected the Cooper’s hawk Dec. 29 and the red-tailed hawk Jan. 9. The USDA’s National Veterinary Services Laboratories on Jan. 26 confirmed that the hawks had avian influenza. The Cooper’s hawk was actually the victim of a predator, though it surely would have died soon from the virus, Mansfield said. The falcon was electrocuted and the hawk in Benton County was killed by something that inflicted a blow, she said. Mansfield said there’s too little evidence to draw conclusions, but it’s possible the virus affects their brains and makes raptors vulnerable, hastening their deaths. “It does raise the question,” she said. Mansfield anticipated avian influenza striking raptors since a captive gyrfalcon in Whatcom County in December died after eating an infected wild duck. The incident showed the virus kills raptors.
_________________ "The time to protect a species is while it is still common" Rosalie Edge Hawk Mountain Sanctuary Founder
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