New study: More livestock workers around the U.S. have gotten the bird flu than has been reported.

“We need to figure out what we can do to stop this thing,” Gray said. “It is not just going away.” The Centers for Disease Control and Prevention bases decisions on its surveillance. For example, the agency has bird flu vaccines on hand but has decided against offering them to farmworkers, citing a low number of cases. But testing for bird flu among farmworkers remains rare, which is why Gray’s research stands out as the first to look for signs of prior, undiagnosed infections in people who had been exposed...