California dairy herds report over 70 percent H5N1 bird flu infection as human cases rise

Over 70 percent of California's dairy cow herds are now infected with H5N1 bird flu, marking a significant increase since late August. The state has the highest number of infections among dairy herds in the U.S. Nearly 70 human cases of H5N1 have been reported nationwide, with the Centers for Disease Control and Prevention confirming the first severe case last week. Most human infections have been mild, and no human-to-human transmission has been documented. The Department of Agriculture is testing vaccines for poultry and dairy cattle in response to the outbreaks. Experts warn that the virus could mutate to spread among humans, but current risks to public health remain low.