Pasteurisation reduces foodborne disease risk primarily because it:[Fill in the blank]

Question

BlackTom AI · Accepted Answer

Pasteurisation targets vegetative cells while relying on refrigeration and hygiene to limit regrowth.

Relevant knowledge points:
- Pasteurisation is a heat treatment (e.g., LTLT 63°C for 30 min or HTST 72°C for 15 s) designed to substantially reduce pathogenic and spoilage vegetative bacteria, yeasts and molds.
- Sterilisation is a different, more severe process that aims to kill all microorganisms including bacterial spores.
- Vegetative cells are heat‑sensitive; bacterial spores (e.g., Clostridium, Bacillus) are heat‑resistant and commonly survive pasteurisation.
- After pasteurisation, preventing illness also depends on cold storage and hygienic handling to prevent surviving organisms or post‑process contamination from growing.

Step‑by‑step reasoning:
1. Identify what pasteurisation does: apply moderate heat sufficient to inactivate vegetative pathogens (Salmonella, Listeria, E. coli, Campylobacter) but not meant to destroy every microorganism.
2. Compare with sterilisation: sterilisation requires higher temperature or different methods (e.g., UHT, autoclaving) to eliminate spores; pasteurisation does not reach these lethal conditions for spores.
3. Recognise limitation: because spores can survive and pasteurised products can be recontaminated after processing, refrigeration and hygiene are essential to prevent germination and microbial growth.
4. Therefore the primary risk reduction from pasteurisation comes from killing vegetative cells; subsequent controls (cold chain, sanitation) manage regrowth and contamination.

Why the correct answer is correct:
- Option D accurately states pasteurisation’s intent and its reliance on refrigeration/hygiene to limit regrowth of survivors or recontaminants.

Why other options are incorrect:
- A is wrong: pasteurisation does not sterilise or kill all microorganisms.
- B is wrong: pasteurisation cannot prevent contamination that occurs during primary production or post‑processing.
- C is wrong: pasteurisation does not eliminate bacterial spores, which are heat‑resistant.

Conclusion: The correct choice is D, matching the provided answer.

Pasteurisation reduces foodborne disease risk primarily because it:[Fill in the blank]Single choice

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