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For any past diseases that were fatal hundreds of years ago, if one arises in our current era, would the association already have the vaccine administrated for possibility of this arising?

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For any past diseases that were fatal hundreds of years ago, if one arises in our current era, would the association already have the vaccine administrated for possibility of this arising?	1
When liquid evaporates inside houses or cars, how come we don't see any substances on our roofs?	1