The H5N1 bird flu outbreak has now spread to dairy cows, affecting three herds in California, the nation's largest milk producer. The virus, first detected in U.S. dairy cows in March, has impacted 14 states and 197 herds, primarily due to cattle movement despite federal testing mandates. While no human cases have been reported in California, the virus has infected dairy workers in other states. Public health officials maintain that the flu is not a significant threat to human health but emphasize the need for protective measures. State fairs in Missouri and Kansas have implemented additional biosecurity protocols to prevent further spread. A federal report highlights the importance of preparedness and response to infections in agricultural workers, who often have limited access to healthcare.