http://edition.cnn.com/2015/09/07/travel/airplane-airport-germs/
Many people assume that food or drink won't be a source of bacteria, but assume that pee or poo would be the biggest source.
That's why cabin attendants mainly clean toilets.
But, the fact is that food or drink is also a source of bacteria. So, the result shows tray has the most denced bacteria.
The result could be feedbacked by airline careers?
