Amid an outbreak of avian influenza, aka bird flu, that has spread to cows in nine states and one person in Texas, federal regulators have detected traces of the bird flu virus in pasteurized milk.

H5N1, an avian flu virus, has killed tens of thousands of marine mammals, and infiltrated American livestock for the first time. Scientists are working quickly to assess how it is evolving and how ...

Scientists have discovered that H5N1, the strain of highly pathogenic avian influenza virus currently spreading in U.S. dairy cows, only needs a single mutation to readily latch on to human cells ...