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

The three people experienced mild symptoms, the CDC said in a statement. The infections occurred in workers who were culling infected animals at a poultry facility that was experiencing an outbreak of H5N1 bird flu, it said.

The symptoms included conjunctivitis, or pink eye, and common respiratory infection symptoms, Colorado officials…