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The backyard flock in Janesville consisted of 22 roosters and egg-laying hens, DATCP spokesperson Kevin Hoffman said.

“More than half of the flock had already died from the virus when we were contacted by the owner,� he said. “The remaining birds were depopulated� to prevent the spread of the virus.

The Janesville specimens were tested by the Wisconsin Veterinary Diagnostic Laboratory and confirmed by the National Veterinary Services Laboratories, the state reported over the weekend.

Wild birds are believed to be the primary source of the diseaseÃÛèÖÊÓƵ spread, Hoffman said. The disease has been reported in 30 states since January, Hoffman said.

Symptoms of the avian flu among birds include:

• Sudden death without clinical signs.
• Lack of energy or appetite.
• Decrease in egg production and/or soft, misshapen eggs.
• Purple discoloration of wattles, comb and legs.
• Difficulty breathing.
• Runny nose, coughing, sneezing.
• Stumbling or falling down.
• Diarrhea.

Poultry owners are encouraged to register their premises with the state, practice enhanced biosecurity and move birds indoors when possible to prevent contact with wild birds.

To report increased bird mortality or signs of illness, call DATCP at 608-224-4872 or 800-943-0003. People can also email datcpanimal imports@wisconsin.gov to report suspected avian illnesses.