Second Human Case of H5 Bird Flu Tied to Dairy Cow Outbreak CDC Staff, May 22, 2024 May 22, 2024 – A human case of highly pathogenic avian influenza (HPAI) A(H5) (“H5 bird flu”) virus infection in the United States has been identified in the state of Michigan. This is the second case associated with an ongoing read more Center for Disease Control (CDC) Report: Second Human Case of H5 Bird Flu Tied to Dairy Cow Outbreak