Postprocessing contamination in processing plants has historically been a significant source of Listeria monocytogenes in ready-to-eat delicatessen meats, and therefore a major cause of human listeriosis cases and outbreaks. Recent risk assessments suggest that a majority of human listeriosis cases linked to consumption of contaminated deli meats may be due to L. monocytogenes contamination that occurs at the retail level. To better understand the ecology and transmission of Listeria spp. in retail delicatessens, food and nonfood contact surfaces were tested for L. monocytogenes and other Listeria spp. in a longitudinal study conducted in 30 retail delis in three U.S. states. In phase I of the study, seven sponge samples were collected monthly for 3 months in 15 delis (5 delis per state) prior to start of daily operation; in phase II, 28 food contact and nonfood contact sites were sampled in each of 30 delis during daily operation for 6 months. Among the 314 samples collected during phase I, 6.8% were positive for L. monocytogenes. Among 4,503 samples collected during phase II, 9.5% were positive for L. monocytogenes; 9 of 30 delis showed low L. monocytogenes prevalence (<1%) for all surfaces. A total of 245 Listeria spp. isolates, including 184 Listeria innocua, 48 Listeria seeligeri, and 13 Listeria welshimeri were characterized. Pulsed-field gel electrophoresis (PFGE) was used to characterize 446 L. monocytogenes isolates. PFGE showed that for 12 of 30 delis, one or more PFGE types were isolated on at least three separate occasions, providing evidence for persistence of a given L. monocytogenes subtype in the delis. For some delis, PFGE patterns for isolates from nonfood contact surfaces were distinct from patterns for occasional food contact surface isolates, suggesting limited cross-contamination between these sites in some delis. This study provides longitudinal data on L. monocytogenes contamination patterns in retail delis, which should facilitate further development of control strategies in retail delis.
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Research Article|
November 01 2014
Listeria monocytogenes and Listeria spp. Contamination Patterns in Retail Delicatessen Establishments in Three U.S. States
COURTENAY SIMMONS;
COURTENAY SIMMONS
1Department of Food Science, Cornell University, 410 Stocking Hall, Ithaca, New York 14850
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MATTHEW J. STASIEWICZ;
MATTHEW J. STASIEWICZ
1Department of Food Science, Cornell University, 410 Stocking Hall, Ithaca, New York 14850
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EMILY WRIGHT;
EMILY WRIGHT
1Department of Food Science, Cornell University, 410 Stocking Hall, Ithaca, New York 14850
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STEVEN WARCHOCKI;
STEVEN WARCHOCKI
1Department of Food Science, Cornell University, 410 Stocking Hall, Ithaca, New York 14850
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SHERRY ROOF;
SHERRY ROOF
1Department of Food Science, Cornell University, 410 Stocking Hall, Ithaca, New York 14850
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JANELL R. KAUSE;
JANELL R. KAUSE
2U.S. Department of Agriculture, Food Safety and Inspection Service, 355 E Street S.W., Suite 9-191, Washington, D.C. 20024
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NATHAN BAUER;
NATHAN BAUER
2U.S. Department of Agriculture, Food Safety and Inspection Service, 355 E Street S.W., Suite 9-191, Washington, D.C. 20024
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SALAM IBRAHIM;
SALAM IBRAHIM
3Department of Human Environment and Family Sciences, North Carolina A&T University, 171 Carver Hall, Greensboro, North Carolina 27411
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MARTIN WIEDMANN;
MARTIN WIEDMANN
1Department of Food Science, Cornell University, 410 Stocking Hall, Ithaca, New York 14850
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HALEY F. OLIVER
HALEY F. OLIVER
*
4Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, USA
* Author for correspondence. Tel: 765-496-3913; E-mail: hfoliver@purdue.edu.
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J Food Prot (2014) 77 (11): 1929–1939.
Article history
Received:
March 24 2014
Accepted:
June 20 2014
Citation
COURTENAY SIMMONS, MATTHEW J. STASIEWICZ, EMILY WRIGHT, STEVEN WARCHOCKI, SHERRY ROOF, JANELL R. KAUSE, NATHAN BAUER, SALAM IBRAHIM, MARTIN WIEDMANN, HALEY F. OLIVER; Listeria monocytogenes and Listeria spp. Contamination Patterns in Retail Delicatessen Establishments in Three U.S. States. J Food Prot 1 November 2014; 77 (11): 1929–1939. doi: https://doi.org/10.4315/0362-028X.JFP-14-183
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