Although there have been reports of human-human transmission of H5N1 in the past, it’s extremely rare and has caused alarm ...

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.

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

Ever since the virus known as H5N1 was identified in dairy cows in March, it’s continued to spread around the country — turning up in 200 herds over at least 14 states.

Earlier this month something concerning happened as avian flu continues to spread among dairy herds. A patient in Missouri tested positive for H5N1, the formal name for the virus. They ...

CDC said that four more healthcare workers have revealed that they had respiratory symptoms. These cases have been linked to ...

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

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

A total of 94 healthcare workers were possibly exposed to the state's first human bird flu case, and the nation's first ...

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

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