A new report suggests that more Americans may be walking around with bird flu − and not even know it. Researchers from the Centers for Disease Control and Prevention randomly tested 150 veterinarians for H5N1,

A new study published by the U.S. Centers for Disease Control and Prevention shows that the H5N1 bird flu virus is likely circulating undetected in livestock in many parts of the country and may be infecting unaware veterinarians.

Bird flu infections were detected among veterinarians tested last fall, including two people with no known exposure to animals with the virus, according to a report released by the U.S. Centers for Disease Control and Prevention on Thursday.

A new study shows that bird flu has silently spread from animals to some veterinarians. The study published Thursday by the Centers for Disease Control and Prevention echoes two smaller ones that detected evidence of infection in previously undiagnosed farmworkers.

Blood testing of large-animal veterinarians suggests that H5N1 bird flu has spread more widely than US surveillance of the virus is capturing, according to a new study by federal and state disease detectives.

The vets had no symptoms, and one worked only in states where no dairy infections had been reported. Three dairy veterinarians, including one who worked only in states with no known bird flu outbreaks in cows,