title: The challenge of respiratory infections.
mesh_terms: D000293:Adolescent; D000328:Adult; D001228:Aspergillosis / Q000209:etiology; D001232:Aspergillus fumigatus; D003428:Cross Infection / Q000209:etiology / Q000517:prevention & control*; D005260:Female; D006801:Humans; D008297:Male; D009864:Ontario; D011014:Pneumonia / Q000209:etiology; D011023:Pneumonia, Staphylococcal / Q000209:etiology; D011552:Pseudomonas Infections / Q000209:etiology; D012124:Respiratory Care Units; D012141:Respiratory Tract Infections / Q000209:etiology* / Q000517:prevention & control