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Volume 29, Number 9—September 2023
Dispatch

Reoccurring Escherichia coli O157:H7 Strain Linked to Leafy Greens–Associated Outbreaks, 2016–2019

Jessica C. Chen1Comments to Author , Kane Patel1, Peyton A. Smith, Eshaw Vidyaprakash, Caroline Snyder, Kaitlin A. Tagg, Hattie E. Webb, Morgan N. Schroeder, Lee S. Katz, Lori A. Rowe2, Dakota Howard, Taylor Griswold, Rebecca L. Lindsey, and Heather A. Carleton
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (J.C. Chen, K. Patel, P.A. Smith, E. Vidyaprakash, C. Snyder, K.A. Tagg, H.E. Webb, M.N. Schroeder, L.S. Katz, L.A. Rowe, D. Howard, T. Griswold, R.L. Lindsey, H.A. Carleton); Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee, USA (K. Patel, C. Snyder)

Main Article

Table 1

Summary of outbreaks caused by reoccurring Escherichia coli O157:H7 strain REPEXH02 linked to leafy greens–associated outbreaks, 2016–2019*

Outbreak No. sequences Timeframe No. sequences, subset Median subset allele differences 
(min–max) Median hqSNP subset differences (min–max) Outbreak source Growing region
D 20 Sep 27–Dec 5, 2016 20 2 (0–5) 3 (0–17) Unknown NA
C 23 Nov 10–-Dec 14, 2017 23 0 (0–3) 1 (0–5) Leafy greens Likely SW USA, Mexico
B3 7 Jul 31–Aug 15, 2018 7 0 (0–3) 1 (0–10) Unknown NA
B2 71 Oct 8–Dec 7, 2018 69 1 (0–4) 2 (0–10) Romaine lettuce Santa Maria, CA
B1 19 Nov 1–Dec 18, 2018 18 2 (0–5) 4 (0–10) Leafy greens NA
A
 179
 Sep 27, 2019–Jan 3, 2020
 84
 1 (0–5)
 2 (0–12)
 Romaine lettuce
 Salinas Valley, CA
Nonhuman samples collected in Santa Maria 23 Nov 14, 2019 12 0 (0–1) 1 (0–5) NA Santa Maria, CA
Not associated with known outbreak
 14
 Oct 18, 2016–Aug 4, 2019
 12
 1 (0–3)
 8 (0–18)
 NA
 NA
All 356 Sep 27, 2016–Jan 3, 2020 245 2 (0–8) 10 (0–39) NA NA

*hqSNP, high-quality single nucleotide polymorphism; NA, not applicable.

Main Article

1These first authors contributed equally to this article.

2Current affiliation: Tulane National Primate Research Center, Covington, Louisiana, USA.

Page created: July 11, 2023
Page updated: August 20, 2023
Page reviewed: August 20, 2023
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