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

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.

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

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

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

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

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

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 ...

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

CDC said that four more healthcare workers have revealed that they had respiratory symptoms. These cases have been linked to ...

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