How is bacterial pneumonia defined?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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Answer

Pneumonia can be generally defined as an infection of the lung parenchyma, in which consolidation of the affected part and a filling of the alveolar air spaces with exudate, inflammatory cells, and fibrin is characteristic. [4] Infection by bacteria or viruses is the most common cause, although infection by other micro-orgamisms such as rickettsiae, fungi and yeasts, and mycobacteria may occur. [4] (See the images below.)

A 53-year-old patient with severe Legionella pneum A 53-year-old patient with severe Legionella pneumonia. Chest radiograph shows dense consolidation in both lower lobes.
A 40-year-old patient with Chlamydia pneumonia. Ch A 40-year-old patient with Chlamydia pneumonia. Chest radiograph shows multifocal, patchy consolidation in the right upper, middle, and lower lobes.
A 38-year-old patient with Mycoplasma pneumonia. C A 38-year-old patient with Mycoplasma pneumonia. Chest radiograph shows a vague, ill-defined opacity in the left lower lobe.

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