Iowa

FILE - In this Oct. 21, 2015, file photo, cage-free chickens walk in a fenced pasture at an organic farm near Waukon, Iowa. Some farmers are wondering if it's OK that eggs sold as free-range come from chickens being kept inside. It's a question that arises lately as farmers try to be open about their product while also protecting chickens from a highly infectious bird flu that has killed roughly 28 million poultry across the country. (AP Photo/Charlie Neibergall, File)

Bird flu outbreak hits over 37M birds across 34 states

A severe outbreak of bird flu has continued to hit bird farms across the nation. On Monday, Pennsylvania reported the thirteenth farm in the state had been affected by the outbreak, which has now hit over 4 million birds in the state alone.