Health officials said the first "severe" case of the H5N1 virus was reported in a human this week, with the person being ...

So far, the H5N1 virus isn't transmitted between people — but the CDC has found a mutation in a human case "concerning." ...

In a positive finding, the CDC emphasized that there is no evidence the virus has spread from the Louisiana patient to others ...

The virus is spreading among animals, while viral mutations raise concerns about potential adaptation to human hosts.

The H5N1 bird-flu virus has been found in new dairy-cattle herds in Southern California. No human-to-human spread has been ...

First come the horseshoe crabs. Hoisting their round, tank-like shells, they trundle out of the Delaware Bay under the first ...

Gov. Gavin Newsom’s declaration has riled up concern, particularly in other top dairy-producing states, such as Wisconsin and ...

Pennsylvania has so far seen no cases of bird flu in cattle and has not detected a case of the virus in domestic birds in at ...

Each week some revelation about bird flu seems to flutter through the news cycle. Here's what the latest research is saying ...