Volume 31, Number 10—October 2025
Synopsis
Retrospective Analysis of Historical Listeria monocytogenes Clinical Isolates, New York, USA, 2000–20211
Figure 4

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