On Thursday, the U.S. Centers for Disease Control and Prevention confirmed another case of avian influenza A(H5N1), or bird flu, in California, bringing the nationwide total of cases to 67.

Bird flu is a disease caused by avian influenza A viruses, according to the CDC. The virus mostly spreads between birds and dairy cows, but there have been 67 human cases of bird flu nationwide and one death tied to the infection since 2024, CDC records show.

Officials from the Centers for Disease Control and Prevention (CDC) recommend that hospitals speed up testing people who are hospitalized with the flu for H5N1 bird flu. Health care workers in