Human bird flu cases grow with 2 more confirmed in California

U.S. and California health officials confirmed two new cases of H5N1 bird flu in dairy farm workers in the state on Friday, bringing the total of infected dairy workers in that state to six, and the total of human cases nationwide this year to 20.

Ten of the U.S. cases were tied to exposure to infected poultry, nine were tied to sick or infected dairy cows, and one case in Missouri occurred in a person who had no known contact with infected animals, the U.S. Centers for Disease Control and Prevention said in a statement on Friday.

The CDC said all six of the cases in California appear to be caused by animal-to-human spread.