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.

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.

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?

Federal health officials say that not only has a Louisiana resident contracted the first severe case of bird flu in the U.S., but that the virus likely mutated in the patient. The findings raise concern regarding the adaptability of the virus.

The Centers for Disease Control and Prevention (CDC) has confirmed the first severe case of bird flu in the United States, noting it has shown a “concerning” mutation, leaving health experts to warn about the risk of another pandemic.

A genetic analysis of the bird flu in the body of a Louisiana man who contracted the first severe case found it mutated inside of his body, a development that could allow the virus to more easily spread to humans.