As the CDC confirmed a severe case in Louisiana of a patient hospitalized with H5N1 bird flu, Gov. Gavin Newsom declared a state of emergency in California related to the virus.

California officials have declared a state of emergency over the spread of bird flu, which is tearing through dairy cows in that state and causing sporadic illnesses in people in the U.S.

Bird flu virus has swept through farms across the nation’s largest dairy producing state. All human cases had been mild - until now.