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Volume 27, Number 1—January 2021

Dispatch

Listeriosis Caused by Persistence of Listeria monocytogenes Serotype 4b Sequence Type 6 in Cheese Production Environment

Magdalena Nüesch-InderbinenComments to Author , Guido V. Bloemberg, Andrea Müller, Marc J.A. Stevens, Nicole Cernela, Beat Kollöffel, and Roger Stephan
Author affiliations: Institute for Food Safety and Hygiene, Zurich, Switzerland (M. Nüesch-Inderbinen, M.J.A. Stevens, N. Cernela, R. Stephan); National Reference Centre for Enteropathogenic Bacteria and Listeria, Zurich (G.V. Bloemberg, A. Müller); Kantonales Laboratorium der Urkantone, Brunnen, Switzerland (B. Kollöffel)

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Figure 2

Minimum-spanning tree based on cgMLST allelic profiles of 34 human Listeria monocytogenes isolates, 1 food isolate, and 5 environmental isolates, Switzerland. Each circle represents an allelic profile based on sequence analysis of 1,701 cgMLST target genes. Values on connecting lines indicate number of allelic differences between 2 strains. Each circle contains the strain identification(s). The food isolate is indicated by a green star, and environmental strains are indicated by blue stars. Outbreak strains are shaded in pink and are shown in comparison with other L. monocytogenes sequence type 6 isolates from Switzerland collected during 2016–2020. cgMLST, core genome multilocus sequence typing.

Figure 2. Minimum-spanning tree based on cgMLST allelic profiles of 34 human Listeria monocytogenes isolates, 1 food isolate, and 5 environmental isolates, Switzerland. Each circle represents an allelic profile based on sequence analysis of 1,701 cgMLST target genes. Values on connecting lines indicate number of allelic differences between 2 strains. Each circle contains the strain identification(s). The food isolate is indicated by a green star, and environmental strains are indicated by blue stars. Outbreak strains are shaded in pink and are shown in comparison with other L. monocytogenes sequence type 6 isolates from Switzerland collected during 2016–2020. cgMLST, core genome multilocus sequence typing.

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Page created: September 23, 2020
Page updated: December 21, 2020
Page reviewed: December 21, 2020
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