[Study of the etiology of respiratory disease in hospital environments].
D006761:Hospitals; D006801:Humans; D012120:Respiration Disorders; D012140:Respiratory Tract Diseases; D012141:Respiratory Tract Infections / Q000209:etiology*; D014777:Virus Diseases / Q000209:etiology*
HOSPITALS; RESPIRATORY TRACT INFECTIONS/etiology; VIRUS DISEASES/etiology