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 ...

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

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 ...

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

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 ...

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

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.

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

In what could be the first cases of bird flu between humans in the US, a group of potential H5N1 infections in Missouri has now grown to 8.