Nosocomial respiratory infections.
D000328:Adult; D000368:Aged; D001419:Bacteria; D003428:Cross Infection / Q000453:epidemiology* / Q000382:microbiology / Q000517:prevention & control; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011020:Pneumonia, Pneumocystis / Q000453:epidemiology; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000382:microbiology / Q000517:prevention & control; D012621:Seasons; D014481:United States