Respiratory Tract Infection is small in size, concise, and its layout is practical, such that physicians, nurses, and medical students will find the information easily accessible. The information provided bridges the gap between theory and patient care while maintaining an excellent focus on etiologic pathogens and therapy. It does not cover pathogenesis, diagnostic approach, or radiologic findings at great length, nor are there details of less common infections such as fungal disease. However, it serves as a guide to current clinical practice, and deals with newly described respiratory pathogens, emerging antibiotic resistance, difficulty in reaching a rapid diagnosis so as to guide treatment, and the high morbidity and mortality associated with improper selection of therapy. This new edition also includes a chapter on bioterrorism causing pulmonary diseases, serving to remind us of an emerging threat that needs to be part of our differential diagnosis.