Department of Agriculture

H5N1 - Bird Flu

What you should know:

What is H5N1?

What is H5N1? H5N1 (called “Highly Pathogenic Avian Influenza” or “bird flu”) is a disease caused by influenza A viruses. Wild birds, particularly waterfowl, can carry and spread these viruses but may show no signs of illness. However, H5N1 can cause severe disease and death in domestic poultry (such as chickens, turkeys, ducks, and geese). H5N1 is causing illness in dairy cattle in multiple states as well, and cases of H5N1 have also been reported in wild birds, mammals, and other domestic companion animals, such as cats. People with close or prolonged contact with infected animals or contaminated environments may be at a higher risk of avian influenza infection.

H5N1 in New Jersey as of 12/05/25

  • Human cases: None.
  • Wild birds: Confirmed detections have occurred in all 21 counties in New Jersey.
  • Poultry:
    • Live Bird Markets: Confirmed detections in Hudson, Mercer, Union and Essex Counties.
    • Commercial Poultry Farms: None.
    • Backyard flocks: Confirmed detections in Atlantic and Salem Counties.
  • Cattle/livestock: None.
  • Cats: Confirmed detections in cats in Hunterdon and Union Counties.
  • Other animals: Confirmed detections in captive bears in Ocean County. Confirmed detections in wild foxes in Essex and Mercer Counties.

News Releases as of 12/05/25

Key Information for the Public

General Audience

Bird Flu: What do you need to know?

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Health Care Providers

H5N1 Avian Influenza: What do health care providers need to know?

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General Resources

Key Information for Healthcare Providers and Local Health Departments

Key Information for Agricultural and Veterinary Workers

Key Information for Hunters

Key Information on Food Safety