Volume 22, Number 12—December 2016
Research
Infectious Dose of Listeria monocytogenes in Outbreak Linked to Ice Cream, United States, 2015
Régis Pouillot
, 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
, 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
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 | ||||||
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Page updated: November 16, 2016
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