Constitution State News

The Connecticut Department of Agriculture (CT DoAg) has reported the detection of highly pathogenic avian influenza (HPAI) H5N1 in a backyard flock in New Haven County. This is the second instance of H5N1 detected in domestic birds within the state this year and the first occurrence in New Haven County for 2025. Previously, a case was confirmed in New London County.

State officials have taken measures to quarantine the affected premises, and all birds on the property have been depopulated to prevent further spread. Confirmation from the U.S. Department of Agriculture’s National Veterinary Services Laboratory is pending, with results expected soon.

The H5N1 virus is highly contagious and can be transmitted through various means including wild birds, infected poultry contact, equipment, and caretakers' clothing or shoes. It affects domestic poultry such as chickens, ducks, and turkeys along with migratory waterfowl. Currently, there is no effective treatment or approved vaccine for poultry against this virus.

“We continue to work with local, state, and federal partners as we respond to reports of sick domestic birds to protect both animal and human health,” said Agriculture Commissioner Bryan P. Hurlburt. “It’s important that all flock owners take the proper steps to protect their birds, remain vigilant in monitoring their flock for sudden changes, and report suspected cases promptly.”

Poultry owners are advised to enhance biosecurity protocols. Recommendations include keeping wild birds out of coops, disinfecting equipment between uses, buying healthy birds from reputable sources, and having a written biosecurity plan.

Suspected cases should be reported immediately by contacting either the State Veterinarian or USDA using provided contact details. Observations of multiple dead wild birds should also be reported for potential testing.

While no person-to-person transmission has been observed so far, precautions are being emphasized due to potential mutation risks. The Connecticut Department of Public Health assesses current public risk as low but urges caution around sick birds.

“The current risk of infection from H5N1 to residents of Connecticut remains low... While we have no evidence of human-to-human transmission at this time, we need to remain vigilant,” stated DPH Commissioner Manisha Juthani, MD.

The CDC continues monitoring numerous cases across the country while tracking virus spread where identified among people or animals.

For further information regarding avian influenza resources or media inquiries contact CT DoAg representative Rebecca Eddy.