So far, the H5N1 virus isn't transmitted between people — but the CDC has found a mutation in a human case "concerning." ...

The ongoing bird flu outbreak has escalated dramatically, now impacting not only poultry but also mammals, including domestic ...

The CDC detected a change in the strain that would allow the virus to more easily travel through human airways.

The UK government has ordered five million doses of an avian influenza vaccine in case it starts being spread by people as ...

The preliminary results will have to be confirmed by the National Veterinary Service Laboratories, which could take well into ...

After a cat's death linked to contaminated pet food and rising cases in livestock, here's how to protect pets from bird flu.

A dozen more dairy herds in California have been stricken with bird flu as the virus continues to infect animals and humans ...

A virologist explains that why this probably isn’t the big one — but that it’s a sign of bad things happening with the virus.

The patient in Louisiana who was hospitalized with severe bird flu illness was found to have a mutated version of the virus.

Two commercial poultry facilities and one backyard flock in the state were the latest instances of highly pathogenic avian influenza in Michigan.

Federal health officials have confirmed unsettling new details about the first United States case of severe bird flu, ...

First come the horseshoe crabs. Hoisting their round, tank-like shells, they trundle out of the Delaware Bay under the first ...