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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
Table 2
Associations between Listeria monocytogenes clonal complexes and food categories in study of clustering and source association of clinical and nonclinical Listeria monocytogenes isolates, New York, USA, 2000–2021*
| CC† | Food category‡ | OR (95% CI)§ | FDR-adjusted p value¶ |
|---|---|---|---|
| CC5, n = 36 | Raw meat, n = 9 | 7.34 (2.89–18.60) | 0.019 |
| CC9, n = 36 | Processed meat, n = 32 | 25.42 (9.12–70.91) | <0.001 |
| CC121, n = 18 | Processed fish, n = 12 | 7.49 (2.78–20.12) | 0.015 |
| CC369, n = 3 | Produce, n = 3 | 167.16 (8.18–3414.14) | 0.015 |
| CC389, n = 4 | Raw dairy, n = 4 | 55.14 (2.92–1042.22) | 0.043 |
| CC573, n = 3 | Produce, n = 3 | 167.16 (8.18–3414.14) | 0.015 |
| CC1078, n = 4 | Raw dairy, n = 4 | 55.14 (2.92–1042.22) | 0.043 |
*Only CC-food category pairs with an FDR-adjusted p value <0.05 are shown (7 out of 660 CC-food category pairs). CC, clonal complex; FDR, false discovery rate; OR, odds ratio. †n value indicates number of food isolates with respective CC. ‡n value indicates number of food isolates with respective food category and with corresponding CC. §A continuity correction of 0.5 was applied to all cells to allow for OR calculation and ensure comparability across categories. ORs >1 indicate overrepresentation of the CC in the corresponding food category. ¶Associations were assessed using 2-sided Fisher exact test followed by FDR correction for multiple comparisons.
1Preliminary results from this study were presented at the 2025 International Association for Food Protection Conference; July 27–30, 2025; Cleveland, Ohio, USA.