Within each of the randomized residence halls assigned to receive an intervention, our goal is to assess the use of face masks and hand sanitizer. The intervention will be put into effect only when two or more virus positive illnesses are detected in a single week. Rapid tests will be available to help in identifying cases if laboratory confirmation may be delayed. The use of face masks will continue until the outbreak is recognized by virology to be coming to a close or after the passage of 6 weeks, whichever occurs first. It is felt that there needs to be a guaranteed duration in order to assure compliance with face mask use.