A new study suggests a culprit in bird flu's rapid spread through US cattle, and how to stop it

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cow udder rigged with machine and tubes for milking
A dairy cow is milked at the South Mountain Creamery farm in Middletown, Maryland.

Carlos Barria/Reuters

Why 4 new bird flu developments have experts worried about the virus

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lineup of black and white cows sticking their heads thorough a metal fence with some cows looking at a small black bird standing on the dirt path in front of them
Since H5N1 made the unexpected jump from birds to cattle, experts are increasingly worried about human spread.

Rodrigo Abd/AP Photo

The 3rd human case of bird flu in the US has 2 new and troubling symptoms

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man dumps feed from a white bucket in front of a lineup of dairy cows behind a metal pole structure
Dairy farmer Brent Pollard gives cows feed at his cattle farm in Rockford, Illinois.

Jim Vondruska/Reuters

Bird flu particles were found in pasteurized milk. A former surgeon general says he isn't changing what he eats.

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racecar driver wearing red firestone cap with wreath of flowers over shoulders chugs milk from a glass bottle
Driver Tony Kanaan of Brazil takes the traditional drink of milk after winning the 97th running of the Indianapolis 500 at the Indianapolis Motor Speedway.

Jeff Haynes/Reuters

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