With so much H5N1 circulating in the U.S., scientists worry we are a few mutations away from a potential human pandemic.

An emerging strain of highly pathogenic avian influenza has spilled over from wild birds to dairy cows in the state of Nevada ...

Dr. Paulo H. Verardi, a virologist and head of the Department of Pathobiology and Veterinary Science at the University of ...

When it comes to the potential of H5N1 avian flu, otherwise known as bird flu, picking up mutations that might lead to human-to-human spread, that "train has already left the station," warns one ...

The virus is spreading with greater speed among animals, with transmission to humans increasing. But risk to the general ...

"[That] doesn't mean that this mutation will be picked up, but what it means to me is that it's not that far away." He explained that H5N1 can also interact with "regular" seasonal flu viruses.

When scientists sequenced the genome of the H5N1 virus that infected her, they found signs that it had begun to develop the kinds of mutations it would need to become a more efficient human pathogen.

To date, this mutation has not been seen in D1.1 strains ... To date, 967 herds across 16 states have been infected with H5N1 bird flu, and nearly 158 million commercial birds have been affected ...

US cases of human bird flu have been relatively few and symptoms have typically been mild. However, if H5N1 mutated and began passing easily between people, "all of this may change." HealthDay ...

When it comes to the potential of H5N1 avian flu, otherwise known as bird flu, picking up mutations that might lead to human-to-human spread, that "train has already left the station," warns one ...