“First Case of H5N1 Bird Flu Found in Oregon Pig Raises Concerns for Human Flu Season”
Oregon state and federal officials confirmed on Wednesday that H5N1 bird flu was found in a pig living in Crook County, marking the first reported swine infection in the current outbreak. The strain of bird flu virus in the pig, known as D1, is slightly different from the B3.13 strain that has been affecting dairy cows in California and other states. It is believed to have originated from wild birds migrating along the Pacific flyway.
Both strains are classified as H5N1, but they have followed slightly different evolutionary paths, as reflected in their genetic sequences. The discovery of the flu virus in a pig is a concerning development, especially as the human flu season begins.
Rick Bright, a virologist and former head of the U.S. Biomedical Advanced Research and Development Authority, expressed his concerns about the situation. He emphasized the need for federal authorities to act quickly and transparently to prevent the spread of the virus.
Swine are considered efficient influenza mixing bowls, as they are susceptible to both avian and human flu viruses. This creates the potential for different viruses to exchange genetic materials and pose a greater threat to humans.
The infected pig in Crook County was one of five living on a small farm. All pigs were tested and euthanized, with results showing low viral levels in the samples. Further testing is pending for the other pigs on the farm.
John Korslund, a retired U.S. Department of Agriculture veterinary epidemiologist, noted that the virus may require close contact, such as shared water, to spread. He highlighted the higher risk of flu transmission in commercial pig herds compared to backyard herds.
The Oregon farm where the infected pig was found is not a commercial operation, and its animals were not intended for commercial food production. Federal officials assured the public that there is no concern about the safety of the nation’s pork supply, as cooking and pasteurization can inactivate the virus.
The farm was previously under quarantine after 70 infected backyard birds were tested and euthanized. The state’s department of agriculture is closely monitoring the area for any further signs of the virus.
While the risk to the public remains low, officials are urging vigilance and caution. Recent outbreaks of H5N1 have been reported in commercial and backyard flocks in British Columbia, Washington, and Oregon. The virus appears to be spreading through migratory waterfowl along the Pacific flyway.
Genetic sequencing data on the latest outbreaks have not been fully disclosed, causing frustration among scientists. The USDA has reported 393 herds infected with H5N1 across 14 states since March, with California accounting for almost half of the cases.
The emergence of a new strain of H5N1 adds complexity to the situation, as the virus continues to circulate among various animal species. Experts warn that the ongoing migration of infected birds poses a significant challenge in controlling the spread of the virus.
Overall, the situation calls for heightened surveillance, rapid response measures, and collaboration among federal, state, and local authorities to prevent further outbreaks and protect public health.