A number of bird flu cases have been reported in the Chicago area in recent weeks, leading to many questions about how quickly the virus is spreading and how worried residents should be.

H5N1 bird flu poses a pandemic threat as CDC identifies 9 alarming mutations enhancing human infection risk Learn about its ...

As bird flu cases in the United States have begun to surface over the past year, public health officials continue to raise ...

Bird flu, also known as avian flu or H5N1, is known to infect birds. However, new findings highlight a growing concern that H5N1 bird flu strains are rapidly mutating and infecting a new host species ...

A major bird flu outbreak has hit a Suffolk County poultry farm. Dozens of state and federal agricultural workers dressed in ...

Philadelphia health officials say a goose found next to Carroll Park in West Philadelphia had highly infectious bird flu.

"The Chinese poultry lineage may have experienced more vaccine-driven selection compared to other lineages," the researchers wrote.

A wild goose found at Green Chimneys in Putnam County has tested positive for H5N1. What to know about bird flu.

The Centers for Disease Control and Prevention are monitoring the bird flu situation in the United States. Here's what to ...

Researchers at Texas Biomed have identified nine mutations in a strain of bird flu found in a person in Texas. Bad news: This ...

The H5N1 virus has mutated —meaning it has begun to adapt to infect humans better—raising new questions about H5N1’s pandemic ...