This reminds me of a high school biology lab we did years ago. The instructions were to go out and get bacteria transfer samples on adhesive tape from where ever you thought would be the best/worst locations. The samples would then be transferred to agar, a nutrient rich protein, then placed in an incubator for several days, and allowed to grow. The monsters that grew off common surfaces ranging from a locker room shower drain to a public drinking fountain (one girl even swabbed, . . . . ahhhhh, . . . . down there) were STUNNING when given the optimal conditions to grow.
People: We would all be long dead by now if our immune systems didn't work just by going about our daily lives. All you can do is stay as healthy as you can, take reasonable sanitary precautions, and hope for the best. When/if the super bug (google MRSA) finds you, it may already be too late.
Chum lee