Follow-up on respiratory illness--Philadelphia. 1977.
D001431:Bacteriological Techniques; D004196:Disease Outbreaks; D019084:Fluorescent Antibody Technique, Indirect; D049673:History, 20th Century; D006801:Humans; D016952:Legionella pneumophila / Q000302:isolation & purification*; D007877:Legionnaires' Disease / Q000266:history*; D015143:Philadelphia / Q000453:epidemiology; D011014:Pneumonia / Q000453:epidemiology / Q000382:microbiology; D012141:Respiratory Tract Infections / Q000453:epidemiology* / Q000382:microbiology