Heat resistance of Listeria monocytogenes.
Raw milk was inoculated with Listeria monocytogenes and heat at 69 degrees C to 73 degrees C. The organism was recovered from 46.6% of the heated samples, but not from samples heated at 73 degrees C, after variable periods at refrigeration temperature. The results suggest that a low number of listeriae survive thermal treatments, but cold enrichment is necessary to repair the thermally injured cells.
Suarez Fernandez
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Department of Animal Pathology I, Veterinary University, Madrid, Spain.
D000818:Animals; D005516:Food Microbiology; D006358:Hot Temperature; D008089:Listeria monocytogenes / Q000502:physiology*; D008892:Milk / Q000382:microbiology*; D012034:Refrigeration; D013997:Time Factors