DES MOINES, Iowa (AP) — Officials say the bird flu virus has been found in four more locations in Iowa, bringing the total number of poultry that must be killed in the state to more than 19 million. The Iowa Department of Agriculture and Land Stewardship announced Monday that new cases were reported at an egg-laying operation in Wright County with 2.8 million chickens and at three turkey farms. Two of the turkey farms are in Buena Vista County and one is in Cherokee County.

State officials didn’t release the number of birds at the turkey operations. The addition of the Wright County chicken farm brings the total number of poultry that must be killed to 19.3 million birds. The birds are killed in an effort to halt the spread of the virus.