None of the health care workers or other contact have tested positive for avian flu antibodies so far — but could their ...

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

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

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

Another health care worker who was exposed to a Missouri patient who tested positive for bird flu developed respiratory symptoms but wasn't tested for the flu.

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

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

"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 ...