Two California dairy workers have been infected with bird flu, state and federal health officials announced late Thursday.

The contacts include several health workers who treated the person for bird flu ... in California with the disease. Results show the viruses closely match the strain in infected dairy cows.

Two dairy workers in California were infected with bird flu, the 15th and 16th human cases detected this year in an ongoing outbreak affecting the nation's dairy cows, health officials said Thursday.

Two dairy workers in California were infected with bird flu, the 15th and 16th human cases detected this year in an ongoing outbreak affecting the nation’s dairy cows, health officials said ...

(USDA Agricultural Research Service via AP, File) (Uncredited) Two dairy workers in California were infected with bird flu, the 15th and 16th human cases detected this year in an ongoing outbreak ...

Two dairy workers in California were infected with bird flu, the 15th and 16th human cases detected this year in an ongoing outbreak affecting the nation's dairy cows, health officials said Thursday.