Just over 9.5 million chickens in Weld County have tested positive for the H5N1 virus, or bird flu, as of Monday, according to latest numbers from the CDC, and state officials say dairy cows are playing a large part in this outbreak. Experts call it a spillover event, when the virus moves from poultry to dairy cows. The Greeley Tribune reports as of July 25, the CDC had confirmed 10 cases of bird flu in humans across Colorado. Nine of these cases involve people working around infected poultry. The tenth was in a dairy worker. There has been no reported human-to-human transmission yet, and both the CDC and state health officials rate the risk of that occurring as very low.
Weld County hit hardest by historic bird flu outbreak, prompting calls for action