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It was a Texas veterinarian who collected samples from dairy farms that confirmed the outbreak of H5N1 bird flu in cattle for the first time. Dr. Barb Petersen monitors more than 40,000 cattle on a dozen farms in the Texas Panhandle. She received reports from farmers of dead birds, ailing cats and sick cows in early March. So far, two people in the U.S. have been confirmed to be infected with H5N1, most recently a Texas dairy worker linked to the cattle outbreak.

An avian flu outbreak has been transmitted to dairy cows, and disease epidemiology experts are worried about the progression of this bug.

The first calls that Dr. Barbara Petersen received in early March were from dairy owners worried about crows, pigeons and other birds dying on their Texas farms. Then came word that barn cats—half of them on one farm—had died suddenly. Within days, the Amarillo veterinarian was hearing about sick cows…

It was a Texas veterinarian who collected samples from dairy farms that confirmed the outbreak of H5N1 bird flu in cattle for the first time. Dr. Barb Petersen monitors more

The H5N1 subvariant of bird flu has been increasingly reported in cattle in recent months.