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.

A pig at an Oregon farm was found to have bird flu.

Even as cases of H5N1 virus among animals and people are rising in the U.S., there’s no evidence of human-to-human transmission.

Four cases in Washington farmworkers are the latest in a drumbeat of human infections across the U.S. as the virus continues to spread among farm animals.

Health officials in California are investigating a possible third human case of bird flu, the California Department of Public Health announced Saturday.

Antibody blood test results expected later this month may help answer a crucial question: Is there human-to-human transmission of the bird flu?

More than a dozen tigers have died after contracting bird flu at a zoo in southern Vietnam.

Public health officials in California are investigating two human cases of bird flu.

Health officials on Thursday said they don’t know how a Missouri person caught bird flu but believe it may be a rare instance of a “one-off” standalone illness.

Health officials say a hospitalized patient in Missouri was infected with bird flu, despite having no known contact with dairy cows or other animals.