A study by the producer of Kleenex, Kimberly-Clark, found that the 6 "Dirtiest Places" in Your Office are:

- break room sink-faucet handles
- microwave door handles
- keyboards
- refrigerator door handles
- water fountain buttons
- vending machine buttons

And don't forget that the "Five Second Rule" doesn't work, says Dr. Susan Rhem, an infectious disease specialist from the Cleveland Clinic:

A common superstition, the five-second rule states that food dropped on the ground will not be contaminated with bacteria if it is picked up within five seconds of being dropped (Wikipedia).

References:

Office Germs: The 6 Dirtiest Work Places. WebMD, 2012.
Image source: Wikipedia, CDC.

Source:
http://feedproxy.google.com/~r/CasesBlog/~3/zEuDEkB_yxk/what-are-6-most-germ-infested-places-in.html