The CDC is calling for expanded testing of bird flu after a child in California tested positive for the virus despite no known contact with animals.

CDC officials say they extended the guidance now because they are seeing more H5N1 patients whose illness they cannot track back to an infected bird or cow.

As the Centers for Disease Control and Prevention (CDC) explains, bird flu is a disease caused by the influenza A virus. At the same time, recent CDC data shows that seasonal influenza A is rising across the U.

A child ill with fever and conjunctivitis in San Francisco tested positive for bird flu but had no known source of transmission.

President Joe Biden's outgoing administration on Thursday announced $211 million in new funding to develop mRNA vaccines against emerging biothreats and said it was accelerating bird flu testing, as fears loom of another pandemic.

By Leah Douglas and Tom Polansek (Reuters) -People hospitalized for flu should be tested for bird flu within 24 hours, the U.S. Centers for Disease Control and Prevention said on Thursday, in an expansion of the agency's efforts to tackle ongoing infections in humans.