With 55 human cases in the US and avian influenza impacting bird populations across the globe, here’s a look at why ...

The spread of bird flu continues to trouble scientists. They say there is no indication that the U.S. has the outbreak under control. And now, a more concerning version of the virus has cropped up.

Efforts to contain the virus are falling short. A teenager in Canada is in critical condition after an unexplained infection.

Health officials in British Columbia, Canada, have failed, for now, to confirm how a teenager there became infected with H5N1 ...

B.C. health officials say they still don't know how a teenager became infected with the H5N1 strain of avian flu, but say no ...

An investigation into the case of a teenager infected with avian flu in British Columbia has found no new cases or evidence ...