Bird flu tests inconclusive on Oregon duck
A wild duck harvested last month in Morrow County in Eastern Oregon had Eurasian bird flu, but tests were unable to determine whether the strain was a danger to poultry, according to the U.S. Department of Agriculture.
A sample from the hunter-shot mallard was collected Nov. 7 by the Oregon Department of Fish and Wildlife.
ODFW state veterinarian Colin Gillin said Friday that preliminary test results caused concern.
The duck would have been the first confirmed case of highly pathogenic bird flu in the U.S. since July. The USDA declared Nov. 18 to the World Organization for Animal Health that the U.S. was free of bird flu, which had prompted trade bans on U.S. poultry products.
The Morrow County duck had Eurasian H5 bird flu, but tests to further define the type and pinpoint the strength of the virus were inconclusive, according to USDA.
“The testing was unable to determine the exact strain of the viruses or whether they were high pathogenic or low pathogenic,” the USDA’s Animal and Plant Health Inspection Service announced Friday.
There are dozens of bird flu strains. The strains that killed millions of birds last winter and spring were H5N8, a highly pathogenic Eurasian virus, and H5N2, a highly pathogenic mix of Eurasian and North American strains. Migratory waterfowl carry the virus and spread the disease to poultry flocks.
Highly pathogenic bird flu struck poultry farms in British Columbia, Canada, in early December 2014.
The virus was then detected in a wild duck across the border in Washington in mid-December, the first U.S. case of highly pathogenic bird flu in a decade.
The virus eventually spread to 15 states and claimed 48 million birds, the largest animal health emergency in U.S. history, according to USDA.
To be on-guard for bird flu’s return, federal and state agencies have tested more than 24,000 wild birds in the U.S. since July 1.
The only bird to test positive for highly pathogenic bird flu was a mallard duck collected in Utah on July 31.
The virus was apparently fairly common in Morrow County last year. ODFW collected samples from fewer than 100 wild birds at the Umatilla National Wildlife Refuge on one day in January and six tested positive for highly pathogenic bird flu.
The last case in a U.S. poultry flock was confirmed June 17.