"Even sporadic cases of human-to-human transmission indicate a big change in the virus and suggest it is exploring new ...

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

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

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.

More than a month after a person in Missouri mysteriously fell ill with H5-type bird flu, investigators in the state are ...

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

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

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

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

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

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

In the absence of PCR testing, infectious disease experts and epidemiologists are anxiously awaiting serology results from ...