- Toilet seat: 49 germs per square inch.

As you can see, the easiest way to get sick in a public restroom is to use your cell phone in there.

Why phones, keyboards and mice are so dirty

The bacteria crawling all over your phone, keyboard and mouse right now may include hundreds of different types, including E. coli, Klebsiella pneumonia, streptococcus, salmonella and staphyloccus aureus (a.k.a. "staph").

Staph can cause anything from pimples, boils and cellulitis, a bacterial infection of the skin, to fatal diseases like pneumonia, meningitis, endocarditis and toxic shock syndrome. Gerba tested 25 cell phones and found staph on almost half of them. Cell phones are extra infected because we hold them against our faces, breathe on them, touch them with our filthy mitts and keep them nice and warm in our pockets.