A virologist explains that why this probably isn’t the big one — but that it’s a sign of bad things happening with the virus.

Amid a "concerning" new mutation in bird flu that may indicate the virus could begin to more easily infect humans, what are the symptoms to watch for and how worried should you be?

The patient in Louisiana who was hospitalized with severe bird flu illness was found to have a mutated version of the virus. Doctors react and share their concerns.

The CDC previously confirmed the first severe human case of bird flu in Louisiana, but now the CDC has confirmed a virus mutation. Find out more here

The Centers for Disease Control and Prevention and other federal agencies are closely monitoring the spread of the HN51 avian influenza, commonly known as the bird flu, nationwide after human cases increased to at least 66.