All of the following are food-borne pathogens, except:

• A. Escherichia coli O157:H7
• B. Mycobacterium tuberculosis
• C. Salmonella enterica
• D. Listeria monocytogenes

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the definition of a food-borne pathogen. These are microorganisms that cause disease and are transmitted to humans through contaminated food.
2. Step 2: Review each listed organism to determine if it is commonly associated with food-borne illness:
3. - Escherichia coli O157:H7 is a well-known food-borne pathogen causing severe gastrointestinal illness.
4. - Salmonella enterica is a classic food-borne pathogen responsible for salmonellosis, often linked to contaminated poultry and eggs.
5. - Listeria monocytogenes is a food-borne pathogen that can cause listeriosis, especially in ready-to-eat foods and dairy products.
6. Step 3: Consider Mycobacterium tuberculosis, which primarily causes tuberculosis, a respiratory disease transmitted through airborne droplets, not through food.
7. Step 4: Conclude that Mycobacterium tuberculosis is not classified as a food-borne pathogen, unlike the other organisms listed.