(I) Disease-causing organisms can be passed along by indirect contact. (II) It was then important to protect yourself from infectious diseases. (III) Many germs can linger on an inanimate object, such as a tabletop, doorknob or faucet handle. (IV) When you touch the same doorknob grasped by someone ill with the flu or a cold, for example, you can pick up the germs he or she left behind. (V) If you then touch your eyes, mouth or nose before washing your hands, you may become infected.