Why finding bird flu in a U.S. pig for the first time is raising new worries

At least one pig has picked up bird flu amid an outbreak in poultry on a backyard farm in central Oregon.

While the infection appears limited to one farm so far, the discovery has raised new alarm bells thanks to pigs’ role as a kind of mixing pot for influenza viruses, potentially leading to genetic mutations that can put people at risk.

Here’s what we know so far about the case and potential risks.

This is the first time a pig in the United States has been infected with this strain of bird flu, called H5N1, the U.S. Department of Agriculture announced on October 30. A necropsy of the

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