Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link

Volume 31, Number 12—December 2025

Synopsis

Two Concurrent Outbreaks of Listeria monocytogenes Infections Linked to Packaged Salads, United States, 2014–2022

Alexandra Palacios1, Michael Vasser1Comments to Author , Asma Madad, Stranjae Ivory, Lauren Edwards, Danielle Donovan, Tiffany Greenlee, Tim Muruvanda, Joseph Baugher, Kurt Nolte, Annemarie Buchholz, Karen Blickenstaff, Mabel Low, Grace Pederson, Jasmine Huffman, Carrie Crabtree, Colby Brown, Meghan Hamel, Rima Kandar, Erin Szidonya, Hannah Caird, Katie Cibulskas, Brandi Taylor, Jodi Taylor, Yamir Rosa, Laura Gieraltowski, and Amanda Conrad
Author affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (A. Palacios, M. Vasser, M. Low, G. Pederson, J. Huffman, L. Gieraltowski, A. Conrad); US Food and Drug Administration, College Park, Maryland, USA (A. Madad, S. Ivory, T. Greenlee, T. Muruvanda, J. Baugher, K. Nolte, A. Buchholz, K. Blickenstaff); Michigan Department of Agriculture and Rural Development, Lansing, Michigan, USA (L. Edwards); Michigan Department of Health and Human Services, Lansing (D. Donovan): Georgia Department of Agriculture, Atlanta (C. Crabtree, C. Brown); Public Health Agency of Canada, Ottawa, Ontario, Canada (M. Hamel, R. Kandar); National Microbiology Laboratory, Winnipeg, Manitoba, Canada (E. Szidonya); British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada (H. Caird); Ohio Department of Health, Columbus, Ohio, USA (K. Cibulskas, B. Taylor); Ohio Department of Agriculture, Reynoldsburg, Ohio, USA (J. Taylor, Y. Rosa)

Main Article

Figure 2

Epidemiologic curve and timeline for 2 outbreaks of Listeria monocytogenes infections linked to packaged salads, United States, 2021–2022 (n = 13 cases). Epidemiologic curve only shows US cases from outbreak A and B during 2021–2022. Both cases from Canada occurred in 2019. MDARD, Michigan Department of Agriculture and Rural Development.

Figure 2. Epidemiologic curve and timeline for 2 outbreaks of Listeria monocytogenes infections linked to packaged salads, United States, 2021–2022 (n = 13 cases). Epidemiologic curve only shows US cases from outbreak A and B during 2021–2022. Both cases from Canada occurred in 2019. MDARD, Michigan Department of Agriculture and Rural Development.

Main Article

1These first authors contributed equally to this article.

Page created: September 30, 2025
Page updated: January 01, 2026
Page reviewed: January 01, 2026
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
file_external