Listeria monocytogenes in Stone Fruits Linked to a Multistate Outbreak: Enumeration of Cells and Whole-Genome Sequencing
Abstract
In 2014, the identification of stone fruits contaminated with led to the subsequent identification of a multistate outbreak. Simultaneous detection and enumeration of L. monocytogenes were performed on 105 fruits, each weighing 127 to 145 g, collected from 7 contaminated lots. The results showed that 53.3% of the fruits yielded L. monocytogenes (lower limit of detection, 5 CFU/fruit), and the levels ranged from 5 to 2,850 CFU/fruit, with a geometric mean of 11.3 CFU/fruit (0.1 CFU/g of fruit). Two serotypes, IVb-v1 and 1/2b, were identified by a combination of PCR- and antiserum-based serotyping among isolates from fruits and their packing environment; certain fruits contained a mixture of both serotypes. Single nucleotide polymorphism (SNP)-based whole-genome sequencing (WGS) analysis clustered isolates from two case-patients with the serotype IVb-v1 isolates and distinguished outbreak-associated isolates from pulsed-field gel electrophoresis (PFGE)-matched, but epidemiologically unrelated, clinical isolates. The outbreak-associated isolates differed by up to 42 SNPs. All but one serotype 1/2b isolate formed another WGS cluster and differed by up to 17 SNPs. Fully closed genomes of isolates from the stone fruits were used as references to maximize the resolution and to increase our confidence in prophage analysis. Putative prophages were conserved among isolates of eachmore »
- Authors:
-
more »
- U.S. Food and Drug Administration (FDA), College Park, MD (United States). Center for Food Safety and Applied Nutrition
- U.S. Food and Drug Administration (FDA), Laurel, MD (United States). Center for Food Safety and Applied Nutrition
- Newcastle Univ., Newcastle upon Tyne (United Kingdom)
- U.S. Food and Drug Administration (FDA), Alameda, CA (United States). Office of Regulatory Affairs
- Publication Date:
- Research Org.:
- Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1626065
- Grant/Contract Number:
- SC0014664
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied and Environmental Microbiology
- Additional Journal Information:
- Journal Volume: 82; Journal Issue: 24; Journal ID: ISSN 0099-2240
- Publisher:
- American Society for Microbiology
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Biotechnology & Applied Microbiology; Microbiology
Citation Formats
Chen, Yi, Burall, Laurel S., Luo, Yan, Timme, Ruth, Melka, David, Muruvanda, Tim, Payne, Justin, Wang, Charles, Kastanis, George, Maounounen-Laasri, Anna, De Jesus, Antonio J., Curry, Phillip E., Stones, Robert, K'Aluoch, Okumu, Liu, Eileen, Salter, Monique, Hammack, Thomas S., Evans, Peter S., Parish, Mickey, Allard, Marc W., Datta, Atin, Strain, Errol A., and Brown, Eric W. Listeria monocytogenes in Stone Fruits Linked to a Multistate Outbreak: Enumeration of Cells and Whole-Genome Sequencing. United States: N. p., 2016.
Web. doi:10.1128/aem.01486-16.
Chen, Yi, Burall, Laurel S., Luo, Yan, Timme, Ruth, Melka, David, Muruvanda, Tim, Payne, Justin, Wang, Charles, Kastanis, George, Maounounen-Laasri, Anna, De Jesus, Antonio J., Curry, Phillip E., Stones, Robert, K'Aluoch, Okumu, Liu, Eileen, Salter, Monique, Hammack, Thomas S., Evans, Peter S., Parish, Mickey, Allard, Marc W., Datta, Atin, Strain, Errol A., & Brown, Eric W. Listeria monocytogenes in Stone Fruits Linked to a Multistate Outbreak: Enumeration of Cells and Whole-Genome Sequencing. United States. https://doi.org/10.1128/aem.01486-16
Chen, Yi, Burall, Laurel S., Luo, Yan, Timme, Ruth, Melka, David, Muruvanda, Tim, Payne, Justin, Wang, Charles, Kastanis, George, Maounounen-Laasri, Anna, De Jesus, Antonio J., Curry, Phillip E., Stones, Robert, K'Aluoch, Okumu, Liu, Eileen, Salter, Monique, Hammack, Thomas S., Evans, Peter S., Parish, Mickey, Allard, Marc W., Datta, Atin, Strain, Errol A., and Brown, Eric W. Mon .
"Listeria monocytogenes in Stone Fruits Linked to a Multistate Outbreak: Enumeration of Cells and Whole-Genome Sequencing". United States. https://doi.org/10.1128/aem.01486-16. https://www.osti.gov/servlets/purl/1626065.
@article{osti_1626065,
title = {Listeria monocytogenes in Stone Fruits Linked to a Multistate Outbreak: Enumeration of Cells and Whole-Genome Sequencing},
author = {Chen, Yi and Burall, Laurel S. and Luo, Yan and Timme, Ruth and Melka, David and Muruvanda, Tim and Payne, Justin and Wang, Charles and Kastanis, George and Maounounen-Laasri, Anna and De Jesus, Antonio J. and Curry, Phillip E. and Stones, Robert and K'Aluoch, Okumu and Liu, Eileen and Salter, Monique and Hammack, Thomas S. and Evans, Peter S. and Parish, Mickey and Allard, Marc W. and Datta, Atin and Strain, Errol A. and Brown, Eric W.},
abstractNote = {In 2014, the identification of stone fruits contaminated with led to the subsequent identification of a multistate outbreak. Simultaneous detection and enumeration of L. monocytogenes were performed on 105 fruits, each weighing 127 to 145 g, collected from 7 contaminated lots. The results showed that 53.3% of the fruits yielded L. monocytogenes (lower limit of detection, 5 CFU/fruit), and the levels ranged from 5 to 2,850 CFU/fruit, with a geometric mean of 11.3 CFU/fruit (0.1 CFU/g of fruit). Two serotypes, IVb-v1 and 1/2b, were identified by a combination of PCR- and antiserum-based serotyping among isolates from fruits and their packing environment; certain fruits contained a mixture of both serotypes. Single nucleotide polymorphism (SNP)-based whole-genome sequencing (WGS) analysis clustered isolates from two case-patients with the serotype IVb-v1 isolates and distinguished outbreak-associated isolates from pulsed-field gel electrophoresis (PFGE)-matched, but epidemiologically unrelated, clinical isolates. The outbreak-associated isolates differed by up to 42 SNPs. All but one serotype 1/2b isolate formed another WGS cluster and differed by up to 17 SNPs. Fully closed genomes of isolates from the stone fruits were used as references to maximize the resolution and to increase our confidence in prophage analysis. Putative prophages were conserved among isolates of each WGS cluster. All serotype IVb-v1 isolates belonged to singleton sequence type 382 (ST382); all but one serotype 1/2b isolate belonged to clonal complex 5.},
doi = {10.1128/aem.01486-16},
journal = {Applied and Environmental Microbiology},
number = 24,
volume = 82,
place = {United States},
year = {Mon Nov 21 00:00:00 EST 2016},
month = {Mon Nov 21 00:00:00 EST 2016}
}
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