Question Bank • QB_EXP_DFE_PST_002 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Milk Pasteurization: HTST & Batch Systems

Subtopic: Index organisms for milk pasteurization

Question Statement:

The official standard index microorganism used as the benchmark for establishing thermal time-temperature combinations in commercial milk pasteurization is:

Options:

  • (A) *Coxiella burnetii* (rickettsia causing Q-fever)
  • (B) *Escherichia coli*
  • (C) *Saccharomyces cerevisiae*
  • (D) *Lactobacillus bulgaricus*

Answer Key:

A

Step-by-Step Solution & Explanation

*Coxiella burnetii* is the most heat-resistant non-spore-forming pathogenic organism found in raw milk. Thermal destruction of *Coxiella burnetii* (and inactivation of the alkaline phosphatase enzyme) guarantees complete destruction of *Mycobacterium tuberculosis* and all other milk-borne pathogens.
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