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Few days ago I was talking to a friend about the outbreak of Black Plague and he explained me an interesting theory according to which Plague became less common 'cause of the diffusion of grey rats that substituted black rats (Grey rats' fleas when rats die move to other rats and not to humans therefore Plague cannot spread.).

(Assuming he was right.)
What if grey rats' fleas moved to humans as black rats' ones?

Plague (Bubbonic? Black?) Strikes Back during the Thirty Years War or the Wars of the Austrian/Polish/Spanish succession?
What about the Seven Years War?
More Europeans colonizing the Americas in order to escape the disease?
Is it possible to have butterflies delaying Plague vaccine?
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