Avian influenza (H5N1) has been spreading in the United States among dairy cows since last year. View on euronews

Signs of recent bird flu infection were found in three US veterinarians, two of whom had no known prior exposure, researchers said, suggesting potentially wider spread of the dangerous virus than has been suspected.

A dairy worker in Nevada is the state’s first human case of bird flu after the employee was exposed to infected dairy cattle. In a release Monday, the Central Nevada Health District confirmed the “state’s first and only” human case of avian influenza,