Question:
What is the most common organism causing ventilator associated pneumonia?
What is the most common organism causing ventilator associated pneumonia?
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Among the ESKAPE bugs, Pseudomonas is the single most common VAP isolate.
Updated On: Jun 24, 2026
- Legionella
- Pneumococcus
- Pseudomonas
- Coagulase negative staphylococcus
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The Correct Option is C
Solution and Explanation
Step 1: Ventilator associated pneumonia (VAP) develops more than 48 hours after intubation and is dominated by hospital-acquired, often multidrug-resistant organisms.
Step 2: Staphylococcus aureus and Pseudomonas aeruginosa together account for most VAP cases. Taken as a single most common organism, Pseudomonas aeruginosa leads at about 21 percent, just ahead of Staphylococcus aureus at about 20 percent.
Step 3: Other frequent VAP organisms are Enterobacter, Klebsiella pneumoniae and Acinetobacter (remember the ESKAPE group). Legionella, pneumococcus and coagulase negative staphylococcus are not the leading causes of VAP.
Step 4: The correct answer is option 3, Pseudomonas.
Step 2: Staphylococcus aureus and Pseudomonas aeruginosa together account for most VAP cases. Taken as a single most common organism, Pseudomonas aeruginosa leads at about 21 percent, just ahead of Staphylococcus aureus at about 20 percent.
Step 3: Other frequent VAP organisms are Enterobacter, Klebsiella pneumoniae and Acinetobacter (remember the ESKAPE group). Legionella, pneumococcus and coagulase negative staphylococcus are not the leading causes of VAP.
Step 4: The correct answer is option 3, Pseudomonas.
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