The H5N1 avian flu is circulating in cows and other mammals. Whether it will make a permanent leap to humans is another ...

H5N1 avian influenza has long been a concerning virus. Since its discovery in 1996 in waterfowl, bird flu has occasionally ...

Here's what we know about human bird flu cases in Colorado, what the state health department says about consuming poultry products and more.

Heat probably played a role in at least four cases of bird flu in poultry workers confirmed by U.S. health officials Sunday — the first cases in poultry workers in two years.

Four cases of avian flu have been confirmed in poultry workers at a farm in northeast Colorado, with an additional presumed case pending confirmation from the Centers for Disease Control and ...

Human bird flu cases tick up; second Colorado poultry farm reports spread Seven cases have been reported in Colorado this month, bringing the total to 11.

There are now 10 human cases of avian flu in the state, according to the Colorado Department of Public Health and Environment, making it the largest outbreak of human bird flu infections in U.S ...

An estimated five more bird flu cases have been reported in Colorado — this time from exposure to infected poultry ...

Colorado has reported three presumptive cases of H5 bird flu virus infection in poultry workers, the Centers for Disease Control and Prevention (CDC) said on Friday.

U.S. cases of bird flu have been relatively mild and limited to farm workers who handled sick animals – a sign the virus may not be well suited to infecting humans in its current state.

Colorado public health officials are warning residents to avoid contact with sick animals after this year's fourth U.S. case of H5N1 bird flu in a human was detected.

Colorado public health officials reported five new cases of bird flu on Sunday, more than doubling the number of bird-to-human cases of the disease in the United States this year.