Are you cowering at the theatre sitting next to a cougher who sounds like a Harley Davidson? Are you apprehensive about a slice of pizza after riding the New York subway without washing your hands? Are you nervous about consuming the bagel with cream cheese you just dropped on the floor of your car? Worry no more. These are not moments to fear, but to embrace! I now refer to these instances as ‘immunitunities’ – an opportunity to build the immune system. Ditch the hand sanitizers, eat well, and get some sleep. Let the next immunitunity work for you.