The fourth detection was in Sac County in northwestern Iowa on Feb. 19, where 29,665 turkeys were destroyed and the second in O'Brien County, also in northwestern Iowa, where 40 commercial layer birds were destroyed. The first detection of the disease was in eastern Iowa in Clinton County in early January.

The bird flu in a flock in western Iowa is the second detection of the deadly virus in Iowa poultry in a week and affected the largest flock so far this year. Entire flocks are culled to help prevent the spread of the virus.

Kim Reynolds authorized a disaster proclamation for Buena Vista County to take effect immediately after announcement of the virus detection. The proclamation give state

A case of highly pathogenic avian influenza was detected in a commercial pullet flock in Buena Vista County Friday, according to the Iowa Department of Agriculture and Land Stewardship. This is the sixth detection of the H5N1 bird flu in Iowa this year,

A backyard flock in Dallas County was the first known infection in more than two weeks in Iowa poultry. March and April are busy months for migrating birds that might carry the virus.