Four additional healthcare workers in Missouri who came in contact with a hospitalized bird flu patient developed mild ...

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

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.

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 ...

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 ...

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

Health authorities in the U.S. are studying seven people who developed influenza symptoms after being exposed to a Missouri ...

A second Missouri healthcare worker who had contact with a hospitalized patient infected with bird flu developed mild ...

A total of 94 healthcare workers were possibly exposed to the state's first human bird flu case, and the nation's first ...

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