Bird flu could be mutating to become more transmissible to humans, scientists have warned, as the US reported its first ...

The ongoing spread of bird flu in the United States has alarmed experts — not just because of human cases causing severe illness, but also due to troubling new instances of infections in cats. A ...

The agency, in its latest update released Thursday, said the mutations were not found in samples taken from wild birds, suggesting the virus changed over the course of the patient’s infection.

The CDC warns samples of the bird flu virus show signs of mutations that could make it more transmissible to humans. The CDC ...

Here’s what to know about the United States’ first confirmed severe case of H5N1 avian influenza—and how to protect yourself.

The Centers for Disease Control and Prevention (CDC) has identified mutations in the H5N1 bird flu virus that may increase ...

However, the CDC tests showed no "flu A," a category that includes both bird flu and seasonal flu ... State and federal health officials say the H5N1 risk to the general public is low, but ...

Two human cases of H5N1 avian flu have been confirmed in San Joaquin County, health officials reported Friday. The cases occurred in farmworkers with known exposure to infected animals, and both ...