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Mutation of AI
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Mild strains can rapidly mutate into lethal ones
as they spread through poultry.
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1983-1984 USA
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H5N2 virus mutated - death rates 90%
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destruction of > 18.5 million birds cost US$ 65
million.
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1999-2001 Italy
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H7N1 virus mutated
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> 13 million birds died or were destroyed.