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 ...

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

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

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

Last month, the C.D.C. announced that a patient in Missouri with no known exposure to infected animals had been hospitalized with gastrointestinal symptoms and had tested positive for H5N1.

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

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

Seven people fell ill with flu-like symptoms after contact with someone infected with H5N1, raising fears that the virus has ...