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Volume 22, Number 12—December 2016

Research

Infectious Dose of Listeria monocytogenes in Outbreak Linked to Ice Cream, United States, 2015

Régis PouillotComments to Author , Karl C. Klontz, Yi Chen, Laurel S. Burall, Dumitru Macarisin, Matthew Doyle, Kären M. Bally, Errol Strain, Atin R. Datta, Thomas S. Hammack, and Jane M. Van Doren
Author affiliations: Food and Drug Administration, College Park, Maryland, USA (R. Pouillot, K.C. Klontz, Y. Chen, D. Macarisin, M. Doyle, E. Strain, T.S. Hammack, J.M. Van Doren); Food and Drug Administration, Laurel, Maryland, USA (L.S. Burall, A.R. Datta); Via Christi Hospitals, Wichita, Kansas, USA (K.M. Bally)

Main Article

Table 1

Estimated contamination level of Listeria monocytogenes per gram and per serving unit of 3 products in a multistate outbreak of ice cream–associated listeriosis, United States, 2015

Product/dose Estimate (95% credible interval)
 Quantile (95% credible interval)
Mean SD 90% 99% 99.9% 99.99%
Product 1
Per g 8 (5–26) 10 (6–62) 17 (10–60) 46 (27–270) 92 (55–730) 160 (97–1,500)
Per 80-g serving
 620 (380–2,100)
 760 (460–4,900)
1,300 (820–4,800)
 3,700 (2,200–22,000)
 7,400 (4,400–58,000)
 13,000 (7,800–120,000)
Product 2
Per g 5 (1–160) 200 (17–35,000) 2 (1–10) 48 (11–620) 520 (91–12,000) 3,600 (470–140,000)
Per 70-g serving
 310 (55–11,000)
 14,000 (1,200–2,500,000)
140 (43–710)
 3,400 (800–43,000)
 37,000 (6,400–840,000)
 250,000 (33,000–9,800,000)
Product 3
Per g 0.12 in 45% of products
Per 160-g serving 8.64 in 45% of servings

Main Article

Page created: November 16, 2016
Page updated: November 16, 2016
Page reviewed: November 16, 2016
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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