This book focuses on World clinics Pulmonary & Critical Care Medicine: Pneumonia. Pneumonia has overwhelming importance in clinical medicine and affects all age groups from neonates to the elderly. It leads on to serious consequences such as sepsis, respiratory failure and death. This book consists of 14 chapters, which include epidemiology and risk factors of pneumonia, etiological diagnosis of pneumonia, role of imaging in respiratory infections, severity assessment of pneumonia, management of pneumonia, community-acquired pneumonia, hospital-acquired and ventilator-associated pneumonia, pneumonia in immunocompromised host, atypical pneumonias, viral pneumonia, fungal pneumonias, parasitic pneumonias, aspiration pneumonias, and pneumonia in children. Epidemic or pandemic nature of illnesses is presented by experts in the concerned fields such as influenza pneumonia and readers will find it interesting to get updated information on such a common disease. This issue extensively discusses bacterial, fungal, viral, and parasitic pneumonia covering the epidemiology, risk factors, clinical features, and management. Newer diagnostic methods including molecular methods are exhaustively discussed.