Room humidifiers and hospitals.
D000193:Actinomycetales Infections / Q000209:etiology; D003428:Cross Infection / Q000209:etiology*; D004865:Equipment and Supplies, Hospital; D006801:Humans; D006813:Humidity / Q000009:adverse effects; D010362:Patients' Rooms; D012141:Respiratory Tract Infections / Q000209:etiology; D014871:Water Microbiology