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Direct quote from one of those sites...
Birds migrating south from China likely made contact with species in Bangladesh and Burma that were migrating west through southern India to Turkey, Van't Hof explains. This is how the virus reached Russia and Eastern Europe.
Birds from Europe are now flying south through Turkey. Soon, Africa will be exposed.
Next spring, when infected birds migrate to the Arctic to nest, they will mix with birds from North America, Van't Hof explained.
The virus is carried by waterfowl, which migrate long distances, increasingly the likelihood it will spread around the globe. How quickly it reaches North America will depend on how many infected birds mix with other fowl in nesting areas, and how close the nests are to each other. But eventually, it will spread.
"There is really no populated area of the world that will be immune," Van't Hof said.
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