California, the biggest U.S. milk-producing state, on Thursday confirmed two human cases of bird flu in people who had ...

Hospital workers reported respiratory symptoms after encountering a Missouri patient with H5N1 who had not been exposed to ...

Further testing could confirm whether the patient, who has since recovered, actually had bird flu despite testing positive.

Missouri officials are under growing pressure from national public health experts to pinpoint the source of the state’s first ...

Chances are low that human-to-human spread of bird flu occurred in a group of people who were exposed to a patient infected ...

Testing is ongoing among five health care workers and a household member exposed to the infected person who all came down ...

Seven people in contact with a patient hospitalized with bird flu also developed symptoms, the C.D.C. reported. Some are ...

None of the health care workers or other contact have tested positive for avian flu antibodies so far — but could their ...

Four additional healthcare workers in Missouri who came in contact with a hospitalized bird flu patient developed mild ...

Four more health-care workers who tended to a person hospitalized with H5N1 bird flu have revealed that they had respiratory ...

Two dairy workers in California were infected with bird flu, the 15th and 16th human cases detected in the U.S. this year.

The big cat outbreak is the latest worrying instance of widespread bird flu transmission to mammals. Bird flu appears to have ...