A study published last year in the Journal of Applied Microbiology found that viruses easily transfer between glass surfaces (think iPad or smartphone faces) and fingertips. And a recent report found that of four iPads swabbed in two Apple stores located in New York City, one contained Staphylococcus aureus, the most common cause of staph infections, while another registered a bacteria associated with skin rash. That's not even counting the cold and flu germs that might be lurking.