If a cold sufferer with viruses on his hand touches a pen
, a keyboard, a doorknob, a dime, or anything, the viruses collect on the object. When you touch the object, and then touch your own nose or mouth, you will get the germs.
What’s the best defense? Don’t touch your face, and especially your nose, with the parts of your hand that you touch things. If you feel the urge to rub your nose or eyes, use the back of your hand.