Lack of bird flu testing may be hiding true spread of virus on US farms The Guardian USOpinion | H5N1 Already Killed Millions of Birds. Humans Share the Blame. The New York TimesFederal dollars to increase bird flu testing for dairy cows, farm workers The Washington PostBird flu cow-testing financial incentive introduced for U.S. farmers NBC News70 people being monitored for bird flu in Colorado KKTV