Bacterial pneumonia causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Arooj Naz

Overview

Bacterial pneumonia may be due to a variety of underlying causes. The microorganisms responsible are divided into Typical and Atypical. Typical bacteria often result in a classic pneumonia whereas atypical bacteria lead to a much milder presentation often referred to as "walking pneumonia". These patients appear near normal but have extensive findings on chest x-ray.

Causes

Typical Pneumonia	Atypical Pneumonia
Streptococcus pneumoniae	Legionella
Staphylococcus aureus	Mycoplasma pneumoniae
Haemophilus influenzae	Chlamydia pneumoniae
Group A streptococci	Chlamydia psittaci
Moraxella catarrhalis
Anaerobes and aerobic gram-negative bacteria