Journal
JOURNAL OF FOOD PROTECTION
Volume 79, Issue 11, Pages 1828-1832Publisher
INT ASSOC FOOD PROTECTION
DOI: 10.4315/0362-028X.JFP-16-208
Keywords
Enumeration; Ice cream; Listeriosis outbreak
Funding
- University of Maryland Joint Institute for Food Safety and Applied Nutrition
- U.S. Food and Drug Administration (FDA) [FDU001418]
- U.S. Department of Energy
- FDA
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A most-probable-number (MPN) method was used to enumerate Listeria monocytogenes in 2,320 commercial ice cream scoops manufactured on a production line that was implicated in a 2015 listeriosis outbreak in the United States. The analyzed samples were collected from seven lots produced in November 2014, December 2014, January 2015, and March 2015. L. monocytogenes was detected in 99% (2,307 of 2,320) of the tested samples (lower limit of detection, 0.03 MPN/g), 92% of which were contaminated at <20 MPN/g. The levels of L. monocytogenes in these samples had a geometric mean per lot of 0.15 to 7.1 MPN/g. The prevalence and enumeration data from an unprecedented large number of naturally contaminated ice cream products linked to a listeriosis outbreak provided a unique data set for further understanding the risk associated with L. monocytogenes contamination for highly susceptible populations.
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