A traveler can be virtually anywhere in the world in under 24 hours. This is great for commerce but such mobility comes at a price. Formerly exotic diseases are also just flight away from anywhere in the world. Sooner or later, massive epidemics will make it to large Western population centers and spread. Not a matter of it but when. Fortunately, thus far, the really bad diseases with no vaccines or effective treatment are not all that easily transmitted person-to-person. Eventually it will happen and that is the price we will have to pay for our interconnectedness.