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

Germany reported an outbreak of highly pathogenic H5N1 bird flu on a farm in the eastern region of Saxony near the border ...

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

Experts call for greater testing of contacts of a person who was infected with the H5N1 bird flu strain before the virus ...

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

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

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

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

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

The bird flu may be entering a dangerous new phase. The risk that any given person will be sickened or die remains low, but ...

What is known so far about the human cases of bird flu in the U.S. is enough to worry those who spend their professional days ...

For influenza viruses, imperfection is a strength. They constantly mutate, producing new strains that challenge immune ...