In late December, a "mysterious" fog engulfed portions of the U.S. Here's a look into the panic that followed.

The H5N1 bird flu virus has been found in samples of Monarch Raw Pet Food, and a cat that ate the food is confirmed to have been infected.

Each week some revelation about bird flu seems to flutter through the news cycle. Here's what the latest research is saying ...

The H5N1 bird flu, or highly pathogenic avian influenza, has been detected in a backyard flock in Vermont, according to state agriculture officials. Bird flu is generally low-risk to humans ...

The bird flu virus found in a severely ill patient hospitalized in the United States has mutated to become better adapted to human airways, though there is no evidence it has spread beyond the ...

The death of an Oregon house cat from bird flu and a pet food recall are raising ... of four house cats that drank recalled raw milk. Dogs seem to be less vulnerable than cats, but they should ...

A Washington state wildlife sanctuary is mourning the deaths of 20 wildcats amid a bird flu outbreak as the virus infects poultry farms, dairy cattle and some people across the nation. The Wild ...

Bird flu has been on the rise in Washington state ... lack of coordination and diarrhea in pet birds, while cats and dogs may experience a fever, lethargy and low appetite, among other symptoms ...

Early this month, health officials in the Democratic Republic of the Congo reported that an unknown, flu-like illness had ... health ministry that read, "The mystery has finally been solved." ...

California Gov. Gavin Newsom has declared a state of emergency due to H5N1, more commonly known as avian influenza or bird flu. The emergency follows an outbreak of the virus among dairy cows in ...

A patient was hospitalized with a severe case of bird flu in Louisiana, the CDC said. This case is the first confirmed instance of a severe human infection linked to the H5N1 virus. The CDC said ...

But the mysterious flu-like disease that has killed more than 143 people — mainly women and young children — in the Democratic Republic of Congo has finally been identified. "The mystery has ...