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

In what could be the first cases of bird flu spreading between humans in the United States, a group of potential H5N1 ...

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.

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.

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

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

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

The CDC said an investigation into a human H5N1 bird flu infection in Missouri has found four additional health care workers ...

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

A third close contact of a patient in Missouri who was hospitalized with H5N1 bird flu has reported that they also ...

A second health worker who cared for a person hospitalized in Missouri with H5N1 bird flu developed mild respiratory symptoms ...

Seven people fell ill with flu-like symptoms after contact with someone infected with H5N1, raising fears that the virus has ...