Avian flu has been detected in a commercial flock of chickens in Pennsylvania for the first time in nearly a year, the state Department of Agriculture announced Monday. The positive test for a strain of highly pathogenic avian influenza turned up in samples from a flock of 50,

Ohio leads the nation in recent bird flu cases among commercial poultry operations, with more than 4.1 million chickens and turkeys affected so far this year. All of the state's confirmed cases of Highly Pathogenic Avian Influenza tracked by the U.