Volume 30, Number 11—November 2024
Research Letter
Outbreak of Listeriosis Likely Associated with Baker’s Yeast Products, Switzerland, 2022–2024
Figure 2
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.