H5N1 avian influenza has long been a concerning virus. Since its discovery in 1996 in waterfowl, bird flu has occasionally ...

The H5N1 avian flu is circulating in cows and other mammals. Whether it will make a permanent leap to humans is another ...

New versions of the H5N1 virus are increasingly adept at spreading. Suggestions to either let it rip in poultry or vaccinate the birds could backfire.

Although the avian flu (H5N1) virus may not be making the news as frequently, it is still working hard behind the scenes, ...

The current strain of bird flu circulating among mammals in the United States may have evolved to infect humans through respiratory infection, meaning it is a step closer to developing human-to ...

A highly contagious and lethal bird flu strain is spreading across parts of the U.S. Bird flu is an increasing threat to ... We know that this virus has been evolving over the past handful ...

Researchers studying the evolution of the bird flu virus over the past 18 years have shown how the strain currently circulating worldwide, an extremely deadly form of the H5N1 subtype, has become ...

Experts warn that this development provides H5N1, the strain responsible for the avian flu, an opportunity to further adapt to humans. ... expressed concern about the evolving situation.

US officials are investigating the appearance of a strain of bird flu identified in the US for the first time, a worrying sign that the virus is evolving in ways that could make it harder to contain.

The Clades of H5N1. An important aspect of characterizing the H5N1 threat is understanding that this strain of influenza A is not monolithic but composed of multiple different clades, or subtypes ...