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

U.S. health officials have run into obstacles in their efforts to determine whether a Missouri person infected with H5N1 bird ...

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

The latest developments are highly concerning, as they raise the possibility that the H5N1 virus has evolved the ability to ...

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

None of the health care workers or other contact have tested positive for avian flu antibodies so far — but could their illness signal human-to-human transmission?

Four additional healthcare workers who cared for the Missouri patient confirmed to have H5N1 bird flu developed mild ...

A cluster of healthcare workers has been tested for H5N1 bird flu in what could be the first cases of human-to-human spread of the virus.

The patient experienced conjunctivitis after contact with infected dairy cattle in the state's Central Valley.

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

At least one household member and six healthcare workers who encountered the index case-patient are being investigated after ...

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