CHICAGO—Avian flu has wiped out 50.54 million birds in the United States this year, making it the country’s deadliest outbreak in history, U.S. Department of Agriculture (USDA) data showed on Thursday.
The deaths of chickens, turkeys, and other birds represent the worst U.S. animal-health disaster to date, topping the previous record of 50.5 million birds that died in an avian-flu outbreak in 2015.
