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

Author(s) : CHEN Y., BURALL L. S., MACARISIN D., et al.

Type of article: Article

Summary

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.

Details

  • Original title: Prevalence and level of Listeria monocytogenes in ice cream linked to a Listeriosis outbreak in the United States.
  • Record ID : 30020077
  • Languages: English
  • Source: Journal of Food Protection - vol. 79 - n. 11
  • Publication date: 2016/11
  • DOI: http://dx.doi.org/10.4315/0362-028X.JFP-16-208

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