" equatorial Africa? Could it have arrived there in one soaring leap, leaving no traces in between? From southwestern Sudan to Manila is almost seven thousand miles as the bat flies. But no bat can fly that far without roosting. Are ebolaviruses more broadly distributed than we suspect? Should scientists start looking for them in India, Thailand, and Vietnam? Or did Reston virus get to the Philippines the same way Taï Forest virus got to Switzerland and Johannesburg—by airplane? If "

― David Quammen , Spillover: Animal Infections and the Next Human Pandemic