Oddly enough, research is showing that a Syphilis evolved a new transmission method in Europe: sex. In the old world it relates closely with other similar pathogens. In the New World it adapted to the environment with a new transmission method.
This means that it traveled not from Europe to America but from America to Europe.
There's a joke in here involving Europe, sex, spring break, and America... but I just can't find it.
UPDATE: Indian-giver?
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