First U.S. detection of virulent H5N9 strain, at a California duck farm, draws scrutiny as evidence of genetic reassortment ...

Bird flu, or avian influenza, is spreading among livestock and other mammals in the United States, raising concerns that ...

The detection of a different more rare strain of avian influenza is raising alarm as record egg prices soar to new highs. A ...

When a pathogen — any organism that causes a disease — jumps species, scientists get nervous because its genetic makeup can ...