A sample of milk from a herd of dairy cows in Maricopa County has tested positive for H5N1 avian influenza, or bird flu, according to the Arizona Department of Agriculture.

Another spillover of the H5N1 bird flu virus from wild birds to dairy cattle appears to have occurred, this time in Arizona.

Avian influenza has been detected in milk from a dairy herd in Maricopa County, according to the Arizona Department of Agriculture.

Milk from every dairy in Arizona has been tested for avian flu at least once since January, but this week was the first time a test turned up positive.

Health officials confirmed the bird flu virus has been detected in dairy milk at a Phoenix-area facility and it’s raising questions on how it could affect humans. This is the first time the virus has ...