By most indications, the avian influenza outbreak that has washed over U.S. farms is at an ebb. Experts don’t seem hopeful, ...

LONDON — The United Kingdom reported the first confirmed case of avian influenza found in sheep, announced the country’s ...

Q: What is avian influenza? Avian influenza, also known as bird flu, is a viral infection that primarily affects birds but ...

The United States is facing a growing threat from the H5N1 bird flu outbreak. Scientists are concerned that existing vaccines ...

The Centers for Disease Control and Prevention (CDC) says the current winter presented unusually high flu risk.

The discovery was made last week, federal officials said. This marks the third instance of bird flu being found in Philly ...

The H5N1 avian influenza virus is mutating to evade immune defenses in mammals following prior infection or vaccination.

A single sheep on a Yorkshire farm has tested positive for H5N1 bird flu, the UK’s Chief Veterinary Officer has confirmed.