Effect of pasteurization

Pasteurization is sufficient to destroy the most heat sensitive of the non-spore-forming pathogenic organisms including all yeasts, molds, many gram-negative bacteria and many gram-positive bacteria. Microorganisms that survive the pasteurization are:

• Thermoduric: organisms that can survive exposure to relatively high temperature, but do not necessarily grow at this temperature. E.g. Streptococcus and Lactobacillus.
• Thermophilic: organisms that not only survive relatively high temperatures, but require high temperatures for their growth.