Mesh : Anti-Bacterial Agents / therapeutic use Canada Community-Acquired Infections / drug therapy Diagnosis, Differential Haemophilus Infections / diagnosis drug therapy Humans Legionnaires' Disease / diagnosis drug therapy Pneumonia, Bacterial / diagnosis drug therapy microbiology Pneumonia, Mycoplasma / diagnosis drug therapy Pneumonia, Pneumococcal / diagnosis drug therapy Practice Guidelines as Topic Pseudomonas Infections / diagnosis drug therapy Spain United States