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 ...

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

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

"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 ...

The Centers for Disease Control and Prevention (CDC) on September 13 shared new information from Missouri officials on ...

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