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

Here's what the latest research is saying about how it is spreading and how to keep yourself and your pets safe.

Genetic analysis of H5N1 bird flu virus that infected a Canadian teenager shows 'worrisome' mutations, new studies reveal.

The call to authorize a vaccine comes after the CDC announced that a person in Louisiana was hospitalized with the country's first known case of severe illness caused by the virus earlier this month.

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

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