Health experts are emphasizing the importance of washing hands to prevent illnesses from being spread as we enter cold and flu season. The CDC says regularly washing your hands can help reduce the spread of germs, including respiratory illnesses by up to 21 percent. Doctor Allan Capin, an urgent care physician at the Cleveland Clinic says that means after a cough, sneeze, bathroom use, handling food, taking out the garbage and being out in public. Capin says hand washing should go on for at least 20 seconds.