Prevalence and level of Listeria monocytogenes in ice cream linked to a listeriosis outbreak in the United States

Yi Chen, Laurel S. Burall, Dumitru Macarisin, Régis Pouillot, Errol Strain, Antonio J. De Jesus, Anna Laasri, Hua Wang, Laila Ali, Aparna Tatavarthy, Guodong Zhang, Lijun Hu, James Day, Jihun Kang, Surasri Sahu, Devayani Srinivasan, Karl Klontz, Mickey Parish, Peter S. Evans, Eric W. BrownThomas S. Hammack, Donald L. Zink, Atin R. Datta

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1828-1832
Number of pages5
JournalJournal of food protection
Volume79
Issue number11
DOIs
StatePublished - Nov 2016

All Science Journal Classification (ASJC) codes

  • Food Science
  • Microbiology

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