Federal health officials are calling for more testing and treatment of workers on farms with bird flu. The new guidance comes after a study showed that some dairy workers had signs of infection, even when they didn’t report feeling sick.

Farm workers who have been exposed to animals with bird flu should be tested for the virus even if they do not have symptoms, the U.S. Centers for Disease Control and Prevention said on Thursday. The change to the agency's testing recommendation comes as the U.

Federal officials said Thursday that farmworkers exposed to bird flu should be tested for the virus even if they are not showing any symptoms, especially if they were not wearing the proper personal protective equipment.