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D000208:Acute Disease; D000368:Aged; D000369:Aged, 80 and over; D017714:Community-Acquired Infections / Q000276:immunology*; D006801:Humans; D007113:Immunity, Innate / Q000276:immunology; D007121:Immunocompetence / Q000276:immunology; D018410:Pneumonia, Bacterial / Q000276:immunology*