Scientists still can't explain avian flu spread

The deadly flu virus that has wiped out nearly 5 percent of Minnesota’s turkey industry is a part of a global disease outbreak, but scientists still don’t understand it. After emerging in Asia, the avian flu spread to poultry farms in the Netherlands, Great Britain, and Germany. Its quick arrival in North America has alarmed scientists who are trying to unravel the mystery of how these deadly bugs have infected so many turkey farms in such a short period of time. 





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