title: The frequency of Legionella infection prospectively determined in children hospitalized with pneumonia.
mesh_terms: D000293:Adolescent; D000907:Antibodies, Bacterial / Q000302:isolation & purification; D002140:California; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007158:Immunologic Techniques; D007223:Infant; D007875:Legionella / Q000276:immunology; D007877:Legionnaires' Disease / Q000453:epidemiology*; D011014:Pneumonia / Q000453:epidemiology / Q000209:etiology* / Q000382:microbiology
chemical_list: D000907:Antibodies, Bacterial