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Volume 32, Number 9—September 2026

Research

Clustering and Source Association of Clinical and Nonclinical Listeria monocytogenes 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, Kimberlee A. Musser, Martin Wiedmann, and Renato H. OrsiComments to Author 
Author affiliation: Cornell University, Ithaca, New York, USA (H. Samut, M. Wiedmann, R.H. Orsi); New York State Department of Health, Wadsworth Center, Albany, New York, USA (D.V. Mendez-Vallellanes, H. Hoyt, S.E. Wirth, L. Mingle, W.J. Wolfgang, K.A. Musser); New York State Department of Agriculture and Markets, Albany (B.D. Sauders, G.A. Deiulio, A.W. Dickey, M.L. Ishida)

Main Article

Table 1

Listeria monocytogenes clonal complexes significantly associated with either clinical or nonclinical isolates in study of clustering and source association of clinical and nonclinical Listeria monocytogenes isolates, New York, USA, 2000–2021*

CC No. clinical isolates No. nonclinical isolates OR (95% CI)† FDR-adjusted p value‡
CCs overrepresented among clinical isolates
CC1 138 50 3.30 (2.34–4.72) <0.001
CC4 53 11 5.45 (2.79–11.63) <0.001
CC217 43 11 4.37 (2.20–9.46) <0.001
CC388 39 11 3.95 (1.97–8.60) <0.001
CC389 35 7 5.57 (2.42–14.93) <0.001
CC554
 37
 9
 4.58 (2.16–10.85)
 <0.001
CCs overrepresented among nonclinical isolates
CC5 63 205 0.29 (0.21–0.39) <0.001
CC9 5 56 0.09 (0.03–0.23) <0.001
CC121 6 27 0.24 (0.08–0.59) <0.001
CC199 3 43 0.07 (0.01–0.23) <0.001
CC288 5 26 0.20 (0.06–0.54) <0.001
CC321 17 80 0.22 (0.12–0.37) <0.001

*Only CCs with an FDR-adjusted p value <0.05 are shown. CC, clonal complex; FDR, false discovery rate; OR, odds ratio. †ORs >1 indicate overrepresentation in clinical isolates, whereas ORs <1 indicate overrepresentation in nonclinical isolates. ‡Statistical significance was assessed using 2-sided Fisher exact test followed by FDR correction for multiple comparisons.

Main Article

1Preliminary results from this study were presented at the 2025 International Association for Food Protection Conference; July 27–30, 2025; Cleveland, Ohio, USA.

Page created: July 30, 2026
Page updated: August 17, 2026
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