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Volume 30, Number 11—November 2024
Research Letter

Outbreak of Listeriosis Likely Associated with Baker’s Yeast Products, Switzerland, 2022–2024

Roger Stephan, Jule Anna Horlbog, Magdalena Nüesch-InderbinenComments to Author , and Nicola Dhima
Author affiliations: Institute for Food Safety and Hygiene, Zurich, Switzerland (R. Stephan, J.A. Horlbog, M. Nüesch-Inderbinen); National Centre for Enteropathogenic Bacteria and Listeria, Zurich (J.A. Horlbog, M. Nüesch-Inderbinen); Swiss Federal Office of Public Health, Bern, Switzerland (N. Dhima)

Main Article

Figure 2

Minimum-spanning tree based on core-genome multilocus sequence typing allelic profiles of 34 human infections by Listeria monocytogenes sequence type 3141, a representative selection consisting of 7 baker’s yeast product isolates, and 1 isolate from a flow pipe in the baker’s yeast production line, Switzerland, 2022–2024. Each circle represents an allelic profile based on sequence analysis of 1,701 core-genome multilocus sequence typing target genes. Values on connecting lines indicate number of allelic differences between 2 strains. Each circle contains the identification of the strain or strains. Blue stars indicate the yeast product isolates; orange star indicates the environmental strain. Strain N23-1507 was isolated from baker’s yeast product during an official food check.

Figure 2. Minimum-spanning tree based on core-genome multilocus sequence typing allelic profiles of 34 human infections by Listeria monocytogenes sequence type 3141, a representative selection consisting of 7 baker’s yeast product isolates, and 1 isolate from a flow pipe in the baker’s yeast production line, Switzerland, 2022–2024. Each circle represents an allelic profile based on sequence analysis of 1,701 core-genome multilocus sequence typing target genes. Values on connecting lines indicate number of allelic differences between 2 strains. Each circle contains the identification of the strain or strains. Blue stars indicate the yeast product isolates; orange star indicates the environmental strain. Strain N23-1507 was isolated from baker’s yeast product during an official food check.

Main Article

Page created: September 04, 2024
Page updated: October 23, 2024
Page reviewed: October 23, 2024
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