RT Book, Section A1 Prakash, Bala A1 Niederman, Michael S. A2 Grippi, Michael A. A2 Elias, Jack A. A2 Fishman, Jay A. A2 Kotloff, Robert M. A2 Pack, Allan I. A2 Senior, Robert M. A2 Siegel, Mark D. SR Print(0) ID 1122368926 T1 Principles of Antibiotic Use and the Selection of Empiric Therapy for Pneumonia T2 Fishman's Pulmonary Diseases and Disorders, 5e YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 978-0-07-179672-9 LK accessmedicine.mhmedical.com/content.aspx?aid=1122368926 RD 2023/03/29 AB Antibiotics are the foundation of therapy for respiratory tract infections. This approach varies with the type of pneumonia, age of the affected patient, presence of various comorbid illnesses and risk factors for infection by specific pathogens, and the severity of the acute illness. For most of the patients, initial therapy is empiric, aimed at a broad spectrum of potential pathogens (see Chapter 122). Once culture data become available, therapy can be pathogen-specific making it possible to de-escalate to fewer drugs with a narrower antimicrobial spectrum.1,2 In some cases, initial empiric therapy must be continued because no etiologic pathogen is identified (see Chapter 123).