A Colorado dairy worker was diagnosed with bird flu, state health officials said Wednesday, becoming the fourth case tied to an outbreak of highly pathogenic avian influenza among U.S. dairy cattle.

Additional Colorado poultry workers have tested positive for H5 bird flu, the state health department announced Thursday. The department said it has now recorded a total of nine poultry cases; six ...

The highly pathogenic avian influenza is also called “H5 bird flu.” The infected workers were culling poultry at a commercial egg operation in northeast Colorado.

Bird flu has infected six farmworkers in Colorado this month — the most in any state — as health officials stressed the importance of preparedness to contain the H5N1 virus spreading in dairy ...

(CBS NEWS) - Three poultry workers from a farm in northeast Colorado are suspected to have contracted bird flu, state and federal health officials announced Friday. The three tested presumptively ...

Three poultry workers in northeastern Colorado tested "presumed positive" for bird flu after responding to an outbreak of the disease at a commercial egg-laying facility.