Everytime you pick up a public phone...touch the poles and rails in the subway, hold onto the machine at the gym, you are coming into contact with a host of pathogens who love your skin and will sink right into your mucous membranes when you rub your eye, chew on your fingernail, touch your nose or kiss someone. You drink from that glass in that restaurant, I guarantee you are inviting at least 100 different kinds of bacteria and viruses into your mouth.
The lucky ones who drink Monavie, pom juice, noni, blueberries, etc etc etc will fight the really bad ones off. Spinach, red peppers, broccoli,kale, seaweed, garlic...they will all help also.
There, you've had your daily lesson gentlemen