Layer Hen Chicken under sunlight lampThe recent outbreak of highly pathogenic avian influenza across multiple states has officially impacted 7.65 million birds as of this weekend, according to USDA. The virus has hit laying hens the hardest, accounting for more than two-thirds of the toll. Reported over the weekend was a flock of more than 915,000 laying hens in Southern Iowa, and just over 664,000 hens in Northeastern Maryland.

The virus is spread via migratory waterfowl and by contact with infected poultry or contaminated vehicles and equipment. Since the first bird flu outbreak was confirmed February 8, the largest losses have been in Wisconsin and Delaware, followed by Maryland and Iowa. A total of 15 states have seen confirmed cases.

Read the latest updates on the spread of bird flu here.