Colorado now home to the largest outbreak of human bird flu infections in U.S. history | 26 July 2024 | There are now 10 confirmed human cases of avian flu in Colorado, making it the largest outbreak of the virus in U.S. history, according to state health officials. The Colorado Department of Public Health and Environment (CDPHE) is reporting three new confirmed bird flu cases at a second farm in Weld County. This latest update brings Colorado's total number of confirmed avian flu cases in humans to ten, with six cases coming from another poultry farm and one case found in a dairy farm worker, also in Colorado. Yesterday, CDPHE launched a data table to track cases of human bird flu in the state.