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Avian influenza: Bird flu spread triggers state of emergency in California

Live Science
Summary
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72% Informative

H5N1 is a subtype of avian influenza, or bird flu.

The virus is spread primarily through wild and domestic birds.

It can also jump to mammals, such as dairy cows and occasionally humans.

The first severe human bird flu case in the U.S. was reported in Louisiana on Wednesday ( Dec. 18 ).