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Disclaimer: Early release articles are not considered as final versions. Any changes will be reflected in the online version in the month the article is officially released.

Volume 31, Number 10—October 2025

Synopsis

Retrospective Analysis of Historical Listeria monocytogenes Clinical Isolates, New York, USA, 2000–20211

Hilal Samut, Damaris V. Mendez-Vallellanes, Hannah Hoyt, Samantha E. Wirth, Lisa Mingle, Brian D. Sauders, Gregory A. Deiulio, Alyssa W. Dickey, Maria L. Ishida, William J. Wolfgang, Martin Wiedmann, and Renato H. OrsiComments to Author 
Author affiliation: Cornell University, Ithaca, New York, USA (H. Samut, M. Wiedmann, R.H. Orsi); Wadsworth Center, New York State Department of Health, Albany, New York, USA (D. V. Mendez-Vallellanes, H. Hoyt, S.E. Wirth, L. Mingle, W.J. Wolfgang); New York State Department of Agriculture and Markets, Albany (B.D. Sauders, G.A. Deiulio, A.W. Dickey, M.L. Ishida)

Main Article

Figure 4

Pairwise SNP distances observed among 321 clinical isolates in clusters in retrospective analysis of historical Listeria monocytogenes clinical isolates, New York, USA, 2000–2021. Each data point represents a pair of isolates from the same county (A), contiguous counties (B), or noncontiguous counties (C). The timespan corresponds to the interval between each isolate pair within clusters in years with a month (1/12 of a year) as the minimum measurable unit. If the clinical isolates in a cluster were collected within the same month of the same year, the timespan for the cluster is 0. SNP, single-nucleotide polymorphism.

Figure 4. Pairwise SNP distances observed among 321 clinical isolates in clusters in retrospective analysis of historical Listeria monocytogenes clinical isolates, New York, USA, 2000–2021. Each data point represents a pair of isolates from the same county (A), contiguous counties (B), or noncontiguous counties (C). The timespan corresponds to the interval between each isolate pair within clusters in years with a month (1/12 of a year) as the minimum measurable unit. If the clinical isolates in a cluster were collected within the same month of the same year, the timespan for the cluster is 0. SNP, single-nucleotide polymorphism.

Main Article

1Preliminary results from this study were presented at the International Association for Food Protection Conference; July 14–17, 2024; Long Beach, California, USA.

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