Three veterinarians specializing in cattle tested positive, according to the study published in the Morbidity and Mortality Weekly Report Thursday. The vets said they never experienced any flu-like symptoms.

By Leah Douglas WASHINGTON (Reuters) -Bird flu infections were detected among cattle veterinarians tested last fall, including two people with no known exposure to animals with the virus, according to a report released by the U.

Ohio is a hotspot for birds with bird flu, and Hamilton County Public Health says 'We want to keep an eye on the spread.'

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.

Three veterinarians had antibodies to bird flu virus, which suggests recent infection, the report said. None of them knew they were working with dairy cattle with known or suspect

The new study is more evidence that the official U.S. tally of confirmed human bird flu infections—68 in the last year—is likely a significant undercount.

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.