Avian influenza, also known as the bird flu, is caused by influenza viruses that spread between birds. According to the Indiana Department of Natural Resources, bird flu is common in wild birds, especially waterfowl, shorebirds and raptors.

Indiana-based Rose Acre Farms, the second largest egg producer in the U.S., has confirmed fowl deaths from bird flu at its Indiana facility.

Indiana-based Rose Acre Farms, the second largest egg producer in the U.S., has confirmed fowl deaths from bird flu at its southern Indiana facility.