Scientists are warning about the continued transmission of dangerous H5N1 bird flu, saying that the virus is more widespread than believed.

A rare case of avian influenza, commonly known as bird flu, has been confirmed in a child in the United States, according to the Centers for Disease Control and Prevention (CDC). The child, who is a resident of California,

New research and discussions with dairy farmers in the Central Valley suggests H5N1 bird flu is more widespread among people than the reported numbers indicate.