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

Microorganisms

[1]

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

Causes of Nosocomial and Ventilator Associated Pneumonia

[2]

Demographics

Most common organism
Neonates (<4 weeks old) Group B streptococci, E coli
Children (4 weeks - 18 years)
Adults (18 - 40 years)
Adults (40 - 65 years)
Elderly (>65 years)
HIV Infected Patients



References

  1. "StatPearls". 2021. PMID 30020693.
  2. "StatPearls". 2021. PMID 30571062.

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