H5N1 bird flu was detected in a pig in a backyard farm in Oregon, the first detection of the virus in swine in the country, the U.S. Department of Agriculture said on Wednesday, Paralel.Az reports citing Reuters.

Pigs were the source of the H1N1 flu pandemic, and have been implicated as the source of others, said Richard Webby, a St. Jude Children's Research Hospital virologist who studies flu in animals and birds for the World Health Organization.

The Oregon farm has been quarantined, and other animals there, including sheep and goats, are under surveillance, USDA said.

Pigs and poultry on the farm were culled to prevent the spread of the virus and enable additional testing of the swine, USDA said. Tests are still pending for two of the pigs, the agency said.

The pigs were not intended for the commercial food supply, and there is no concern about the safety of the nation’s pork supply, according to the agency.