- Six broad groups were tested - seafood, produce, dairy, meat, eggs, and combination foods)
- Samples were collected weekly at large national chain supermarkets and independent grocery stores between December 2010 and March 2013.
- 27,389 total samples were taken with
- 116 samples tested positive by the BAX PCR system for L. monocytogenes, and the pathogen was isolated and confirmed for 102 samples (0.3%)
- 571 samples that tested positive for Listeria-like organisms
A few takeaways
- Screening samples used a 25 gram sample. If a larger sample size was used, would the percent positive be higher?
- Sampling ended over 4 years ago. If sampling and testing were conduced today, would we expect lower numbers?
- Cut raw vegetables were the highest at 1%., but the scariest is the pre-made salads - seafood salad and deli-type salads (and pre-made sandwiches) since those would be consumed without any preparation and the numbers/gram were generally lower.
- While the percentage of cheese samples that were positive are low, there where some high numbers on those that tested positive.
Journal of Food Protection
http://jfoodprotection.org/doi/abs/10.4315/0362-028X.JFP-16-420?code=fopr-site
Survey for Listeria monocytogenes in and on Ready-to-Eat Foods from Retail Establishments in the United States (2010 through 2013): Assessing Potential Changes of Pathogen Prevalence and Levels in a Decade
John B. Luchansky,1 Yuhuan Chen,2* Anna C. S. Porto-Fett,1 Régis Pouillot,2 Bradley A. Shoyer,1 Rachel Johnson-DeRycke,3† Denise R. Eblen,3† Karin Hoelzer,2‡ William K. Shaw Jr.,3 Jane M. van Doren,2 Michelle Catlin,3 Jeehyun Lee,4§ Rohan Tikekar,4§ Daniel Gallagher,5 James A. Lindsay,1 The Listeria Market Basket Survey Multi-Institutional Team,‖ and Sherri Dennis2
http://jfoodprotection.org/doi/abs/10.4315/0362-028X.JFP-16-420?code=fopr-site
Survey for Listeria monocytogenes in and on Ready-to-Eat Foods from Retail Establishments in the United States (2010 through 2013): Assessing Potential Changes of Pathogen Prevalence and Levels in a Decade
John B. Luchansky,1 Yuhuan Chen,2* Anna C. S. Porto-Fett,1 Régis Pouillot,2 Bradley A. Shoyer,1 Rachel Johnson-DeRycke,3† Denise R. Eblen,3† Karin Hoelzer,2‡ William K. Shaw Jr.,3 Jane M. van Doren,2 Michelle Catlin,3 Jeehyun Lee,4§ Rohan Tikekar,4§ Daniel Gallagher,5 James A. Lindsay,1 The Listeria Market Basket Survey Multi-Institutional Team,‖ and Sherri Dennis2