A highly pathogenic avian influenza has been detected for the first time in a backyard flock in Maine.

Federal officials confirmed the avian flu on Sunday and said state officials quarantined property in Knox County and eliminated the birds to prevent the spread of the disease.

The virus is often spread to domestic poultry by infected wild birds.

U.S. surveillance efforts have identified the virus in a number of states including New Hampshire, where it was found this month in 20 wild ducks.

Bird owners should prevent contact between their birds and wild birds, and report sick birds or unusual bird deaths to state or federal officials.

The CDC says the avian flu represents no immediate public health concern.