Progressive Patient CareRestaurantsAir ConditioningTravelSwimming PoolsHealth ResortsHousingHydrotherapyLegionnaires' DiseaseDisease OutbreaksNitrogen CompoundsNorwalk virusCaliciviridae InfectionsHawaiiLegionellaHomeless PersonsConvalescenceGastroenteritisLegionella pneumophilaBed OccupancyNorovirusWater PollutionVirginiaFoodborne DiseasesWater SupplyAir Pollution, IndoorWater MicrobiologyWorkplaceFresh WaterEnvironmental MonitoringOccupational HealthOccupational DiseasesDiarrheaQuestionnairesCross-Sectional Studies