One of the big issues with the modern interconnected world is nothing stays isolated. Diseases that in the past what would have stayed in one country now quickly spread everywhere.
I have even seen reports that there is concern about Zika carrying mosquitoes being inside luggage so that even if the person does not come back with the virus when they open their suitcase it can fly out and still infect someone.
Oh joy - yet another thing to be worried about!
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