Birds: Avian flu is caused by influenza viruses that mostly live in certain types of birds and make them sick. Very rarely such strains of flu virus will infect humans and make them sick. When such strains are found, the bird flock is usually killed. The area of the world, the person's nearness to sick birds and the strength of the person's immune system are all important factors in a person's risk.
Answered 6/11/2017
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