One scenario, two outcomes:
Man gets a head cold. He takes to his bed for a week and lets his wife wait on him hand and foot, as he moans in misery and sips hot tea and chicken soup that she brings him, and holds his hot water bottle.
His wife catches the same cold from him a few days later. He advises her to make sure to wash the dishes in hot soapy water, because “The steam will help clear your sinuses.”