Question:
Which one of the following is a psychotropic non-spore forming pathogen?
Which one of the following is a psychotropic non-spore forming pathogen?
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Listeria monocytogenes is the classic non-spore-forming psychrotrophic pathogen that proliferates at refrigeration temperatures.
Updated On: Sep 15, 2026
- B. cereus
- L. monocytogenes
- B. subtilis
- S. aureus
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Foodborne pathogens vary in their thermal growth ranges and endospore-forming capacity.
Step 2: Detailed Explanation:
Listeria monocytogenes is a Gram-positive, non-spore-forming, facultative anaerobic rod capable of growing at refrigeration temperatures ($0\text{--}4^\circ\text{C}$), making it a major psychrotrophic food safety hazard in ready-to-eat chilled foods.
Bacillus cereus and B. subtilis are spore-formers, while Staphylococcus aureus is mesophilic (does not grow below $7^\circ\text{C}$).
Step 3: Final Answer:
Therefore, L. monocytogenes is the psychrotrophic non-spore-forming pathogen.
Foodborne pathogens vary in their thermal growth ranges and endospore-forming capacity.
Step 2: Detailed Explanation:
Listeria monocytogenes is a Gram-positive, non-spore-forming, facultative anaerobic rod capable of growing at refrigeration temperatures ($0\text{--}4^\circ\text{C}$), making it a major psychrotrophic food safety hazard in ready-to-eat chilled foods.
Bacillus cereus and B. subtilis are spore-formers, while Staphylococcus aureus is mesophilic (does not grow below $7^\circ\text{C}$).
Step 3: Final Answer:
Therefore, L. monocytogenes is the psychrotrophic non-spore-forming pathogen.
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