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Pathogens in Pneumonia

Here is a quick review of the pathogens causing pneumonia (useful for enumerating differentials
Pathogens in Pneumonia ... pathogens causing pneumonia ... cases) TYPICAL ORGANISMS ... FACTOR): - S. pneumoniae ... ) ATYPICAL ORGANISMS
Pneumonia - Causative Organisms
 • CAP - Typical, Atypical, Endemic
 • Aspiration
 • Decreased Immunity
 •
Pneumonia - Causative ... Organisms • CAP ... Residency @CMC_IM #Pneumonia ... differential #diagnosis #organisms
Chlamydia trachomatis - Infection of the Newborn
 • Newborns 3-16 weeks old 
 • Afebrile (appears
topical) • Pneumonia ... Pathologic Chlamydial organisms ... cervicitis, newbom pneumonia ... Chlamydophila pneumoniae ... (mild pneumonia
Cephalosporin Coverage
First-generation cephalosporins: 
 - Gram (+) cocci: Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus pneumoniae, Streptococcus pyogenes,
Streptococcus pneumoniae ... coli, Klebsiella pneumoniae ... Streptococcus pneumoniae ... - Anaerobic organisms ... Streptococcus pneumoniae
Typical therapeutic applications of Tetracyclines (Doxycycline)
Gram (+) cocci: Staphylococcus aureus (including methicillin-resistant strains), Streptococcus pneumoniae
Gram (+)
Streptococcus pneumoniae ... pestis Anaerobic organisms ... Mycoplasma: Mycoplasma pneumoniae
PJP (Pneumocystis jirovecii Pneumonia) in HIV vs non-HIV immunocompromised patients: same organism, different disease entities, different
Pneumocystis jirovecii Pneumonia ... patients: same organism ... Pneumocystis #jirovecii #Pneumonia
Cavitation - Pneumonia
In virulent pyogenic infections an abscess may form within the consolidated lung as a
Cavitation - Pneumonia ... seen in viral pneumonia ... streptococcus pneumoniae ... No micro-organism ... CTChest #Cavity #Pneumonia
Community Acquired Pneumonia (CAP) - Diagnosis and Management

Pneumonia Signs/Symptoms:
 • Confusion/disorientation (LR + 1.9)
 • Cough
Community Acquired Pneumonia ... Management Pneumonia ... Streptococcus pneumoniae ... • Chlamydia pneumoniae ... Multidrug-Resistant Organisms
Aminoglycosides  - Antibiotics Class Overview

Gentamicin, Tobramycin, Amikacin, Streptomycin -30S inhibitor (all IV)
Spectrum: Extremely efficacious vs.
is suspected (pneumonia ... gram positive organisms
Diffuse consolidation in bronchopneumonia
Here another case of diffuse consolidation.
This patient had fever and cough.
This was thought
Unlike lobar pneumonia ... by many micro-organisms ... be legionella pneumonia ... Radiology #CXR #Pneumonia