Another human case of bird flu linked to sick dairy cows has been detected in Michigan, marking the third farmworker diagnosed with the illness in the United States since March, the Centers for Disease Control and Prevention reported Thursday. None of the cases are connected.

This is the second farmworker in Michigan in a week to be diagnosed with the illness. And a dairy worker in Texas was diagnosed in March. In those cases, the patients’ only sign of illness was a pink eye.

This latest case…