Question

Most of the food spoilage pathogens are :

• A. Psychrophiles
• B. Thermophiles
• C. Mesophiles
• D. Psychrotrophs

Hint:

Most human pathogens are mesophiles because their optimal growth temperature aligns with human body temperature ($37\text{^\circ C}$). However, the bacteria that spoil food in your refrigerator are psychrotrophs.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Microorganisms are classified into groups based on their optimal growth temperature ranges: psychrophiles (cold-loving), mesophiles (moderate-temperature-loving), and thermophiles (heat-loving).
Detailed Explanation:
- Mesophiles (3): These organisms grow best at moderate temperatures, typically between $20\text{^\circ C}$ and $45\text{^\circ C}$, with an optimum near human body temperature ($37\text{^\circ C}$).
Almost all human foodborne pathogens (such as Salmonella, Escherichia coli, Staphylococcus aureus, and Vibrio cholerae) are mesophiles.
- Psychrotrophs (4): These are cold-tolerant mesophiles that can grow at low temperatures ($0\text{ to }7\text{^\circ C}$), making them the primary cause of spoilage in refrigerated foods.
- Psychrophiles (1): These organisms require cold temperatures to survive ($<$ $15\text{^\circ C}$) and cannot grow at room temperature.
- Thermophiles (2): These organisms grow best at high temperatures ($50\text{ to }80\text{^\circ C}$).
Because human pathogens must survive and replicate inside the human body to cause disease, the vast majority of foodborne pathogens are mesophiles.

Step 2: Final Answer:
Most foodborne pathogens are classified as Mesophiles.