Question Bank • QB_SUB_DFE_PAS_001 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Milk Pasteurization: HTST & Batch Systems

Subtopic: Index organisms for milk pasteurization

Question Statement:

The standard index organism used to define the minimum thermal time-temperature standards for commercial milk pasteurization is:

Options:

  • (A) Coxiella burnetii
  • (B) Clostridium botulinum
  • (C) Bacillus stearothermophilus
  • (D) Escherichia coli

Answer Key:

A

Step-by-Step Solution & Explanation

Coxiella burnetii is the most heat-resistant non-spore-forming pathogen found in raw milk, requiring $71.7^\circ\text{C}$ for $15\text{ s}$ (HTST) or $62.8^\circ\text{C}$ for $30\text{ min}$ (LTLT).
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