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

When a pathogen — any organism that causes a disease — jumps species, scientists get nervous because its genetic makeup can reconfigure and become more transmissible or lethal.

Flu activity has surged to high levels in many states, overwhelming some hospitals. Experts discuss what to expect for the 2024-25 flu season and how to stay safe.

A 'quad-demic' of winter illnesses is surging throughout the South, Midwest, and parts of the Northeast US, according to the latest surveillance data reported this week by the CDC.

Avian influenza A (H5N1) has mutated, so the symptoms of bird flu could change as more people get sick in 2025.

The widening U.S. bird flu outbreak has made its way to Maryland, which has counted two cases on commercial poultry farms — one in Caroline County and another in Queen Anne’s County — since the start of the year.

Learn about the CDC's new measures for clinicians, including prompt testing for bird flu and antiviral treatment, to respond to the outbreak.

The U.S. Centers for Disease Control and Prevention (CDC) is urging health care workers to accelerate bird flu testing

The U.S. Centers for Disease Control and Prevention is urging health care workers to accelerate bird flu testing for patients hospitalized with flu symptoms.

The U.S. has reported its first death due to bird flu, aka H5N1. How deadly is H5N1? Experts discuss bird flu fatality rate amid ongoing outbreak.

Flu activity remains high in Louisiana. That’s the word from state health officials and detailed in the Respiratory Virus Dashboard provided by the Louisiana Department of Health (LDH). In fact, community health specialist Dr. Eric Griggs says hospitalizations in Louisiana are up, as well.

The Centers for Disease Control and Prevention today released an advisory recommending clinicians expedite subtyping of type A influenza samples from hospitalized patients, particularly individuals in an intensive care unit.