Germs are everywhere, but when we travel the situation is even worse. The sheer amount of people passing through airports and airplanes is bad enough. Add the fact that all of these people are coming from many different parts of the world and carrying a number of unique germs, and you can see why travelling often gets people sick.

To see just how dirty the airports and planes really are, travelmath.com sent a microbiologist to take samples from five airports and four flights. The results held some surprises, but take a look at the slideshow to see the top six surfaces that had the most colony-forming units (CFUs) per square inch.