Severe Pneumonia.

Severe pneumonia is a leading cause of mortality and morbidity worldwide. Being a complex condition caused by a variety of microorganisms including bacteria, viruses, and fungi, it requires intensive care. A combination of early initiation of antimicrobial therapy and adjunctive nonantimicrobial interventions improve patient outcomes. This article reviews the most recent data on the epidemiology, microbiology, diagnosis, and management of severe pneumonia.