3 Colorado poultry workers test presumptively positive for bird flu

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 positive for H5N1, also known as avian influenza, while working at a "commercial egg layer operation," the Colorado Department of Public Health and Environment said in a statement.

They were culling poultry at the farm when they showed mild symptoms, including pink eye and common respiratory infections, the agency said. None required hospitalization.