The Centers for Disease Control and Prevention should have results later this month that provide more insight into how a ...

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

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

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

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

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

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

Chances are low that human-to-human spread of bird flu occurred in a group of people who were exposed to a patient infected ...

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

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

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

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