Avian flu in dairy cows could stick around on US farms forever, and is raising the risk of outbreaks in mammals—including humans—around the world.

A person in Missouri has tested positive for bird flu despite having no known contact with animals, officials said.The patient is the 14th person in the US to be diagnosed with the disease since March when the virus was first detected in cows.

Another person has fallen ill with bird flu in the United States, but this time, public health officials don't know how they caught the highly pathogenic avian influenza virus (HPAIV).

With cold and flu season approaching, it’s worth knowing about another virus out there—albeit extremely rare: bird flu. Like the regular flu, bird flu virus symptoms include fever, cough and a sore throat.

Genetic analysis of a bird flu virus detected in a person in Missouri who didn’t previously have contact with animals offers more details on the case, but experts say there isn’t substantial evidence