A Michigan dairy worker was confirmed as the second case of bird flu linked to dairy cows among humans in the United States.

The second-ever case of bovine-to-human transmission of the highly pathogenic H5N1 bird flu was confirmed by the Centers for Disease Control and Prevention on April 1, weeks after the first case of the disease was confirmed in Texas cows. State and public health officials confirmed a second case of the current outbreak on Wednesday, this time in Michigan.