H5N1 bird flu is spreading through poultry and cattle in the United States, and some cases have been reported in people.
No human-to-human spread of the virus has been documented, and the vast majority of infections stem from contact with farm animals. Because of this, the Centers for Disease Control and Prevention (CDC) considers the risk to the general public very low. However, a recent CDC study found that the respiratory virus is evolving to better infect mammals.
