Anthony Bourdain, who once ate an unwashed warthog anus because a Namibian tribal chief considered it a great honor to offer it, always warns to stay clear of airport food for just this reason.
I like his warning to stay clear of buffets at Western style hotels in less developed countries. The local street vendors know they will lose customers if their food makes people sick, but by the time the three day old Bolognese sauce from the buffet catches up, you'll be long gone.
http://www.newsweek.com/anthony-bour...et-sick-451642