A highly contagious and lethal strain of bird flu is spreading across parts of the U.S.
Across the eastern and central U.S., a highly contagious and lethal strain of bird flu is now spreading. Since February, more than 13 million chickens, turkeys and other birds have died because of the disease or have been culled to stop the spread. Poultry producers and backyard flock owners are trying to learn more from past outbreaks to protect their birds.