Question:medium
A patient presented with 70% burns. A test was done on a sample collected from the burnt site as shown in the picture in suspicion of the probable causative organism which is an obligate aerobe. What's the microbe?
A patient presented with 70% burns. A test was done on a sample collected from the burnt site as shown in the picture in suspicion of the probable causative organism which is an obligate aerobe. What's the microbe?
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Think of the obligate aerobe that commonly colonizes burn wounds and produces a characteristic blue-green pigment.
Updated On: Jun 23, 2026
- Pseudomonas aeruginosa
- Meningococcus
- Streptococcus pyogenes
- Pneumococcus
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The Correct Option is A
Solution and Explanation
Approach via organism characteristics:
The key constraint is obligate aerobe causing infection in a burn patient.
Among the options:
- $\text{Pseudomonas aeruginosa}$: obligate aerobe, gram-negative rod, motile -- classic burn wound pathogen
- $\text{Meningococcus}$: facultative anaerobe
- $\text{Streptococcus pyogenes}$: facultative anaerobe
- $\text{Pneumococcus}$: facultative anaerobe
$\text{Pseudomonas aeruginosa}$ produces pyocyanin (blue-green pigment), pyoverdin, and exotoxin A. It is gram-negative, motile with polar flagella, oxidase-positive, and the leading cause of burn wound sepsis. It is the only obligate aerobe among the choices.
\[\boxed{\text{Pseudomonas aeruginosa}}\]
The key constraint is obligate aerobe causing infection in a burn patient.
Among the options:
- $\text{Pseudomonas aeruginosa}$: obligate aerobe, gram-negative rod, motile -- classic burn wound pathogen
- $\text{Meningococcus}$: facultative anaerobe
- $\text{Streptococcus pyogenes}$: facultative anaerobe
- $\text{Pneumococcus}$: facultative anaerobe
$\text{Pseudomonas aeruginosa}$ produces pyocyanin (blue-green pigment), pyoverdin, and exotoxin A. It is gram-negative, motile with polar flagella, oxidase-positive, and the leading cause of burn wound sepsis. It is the only obligate aerobe among the choices.
\[\boxed{\text{Pseudomonas aeruginosa}}\]
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