Bird flu refers to the disease caused by an infection with the bird.
These viruses naturally spread among wild aquatic birds worldwide and can infect domestic poultry and other bird and animal species.
Bird flu viruses do not normally infect humans.
Bird flu spreads between both wild and domesticated birds.
It has also been passed from birds to humans who are in close contact with poultry or other birds.
There is no clear evidence that the virus can be transmitted from human to human.
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