Why dangerous bird flu is spreading faster and farther than first thought in U.S. cattle

While American officials are ramping up testing to keep sick cows from being moved between states, scientists say we’re already several steps behind the spread of a disease that could pose a major threat to human health.

Why dangerous bird flu is spreading faster and farther than first thought in U.S. cattle
A graphic of a black cow nose to nose with a bird against an orange background.

While American officials are ramping up testing to keep sick cows from being moved between states, scientists say we’re already several steps behind the spread of a disease that could pose a major threat to human health.