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

Hospital workers reported respiratory symptoms after encountering a Missouri patient with H5N1 who had not been exposed to ...

The latest developments are highly concerning, as they raise the possibility that the H5N1 virus has evolved the ability to ...

U.S. health officials have run into obstacles in their efforts to determine whether a Missouri person infected with H5N1 bird ...

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

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

Further testing could confirm whether the patient, who has since recovered, actually had bird flu despite testing positive.

A routine flu screening in late summer found the H5N1 virus in a Missouri patient. Unlike the other reported cases, this ...

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 ...

Missouri officials are under growing pressure from national public health experts to pinpoint the source of the state’s first ...

In the absence of PCR testing, infectious disease experts and epidemiologists are anxiously awaiting serology results from ...