Yersinia Isolates 2021

Friday 2nd December 2022


Yersinia case isolate numbers were higher this year than any other year in our records.

Yersinia enterocolitica biotype 2/3 serotype O:9 continues to dominate as the causative agent of NZ yersiniosis.

Selected isolates have been sequenced as part of surge investigations and for projects such as the ESR-led, HRC-funded three-year study Unravelling the mysteries of yersiniosis commenced in 2021.

Common bioserotypes continue to be associated with specific McNally 7-gene multi locus sequence types:

Yersinia enterocolitica biotype 2/3 serotype O:9 ST12

Yersinia enterocolitica biotype 2/3 serotype O:5,27 ST14

Yersinia enterocolitica biotype 4 serotype O:3 ST18

A comprehensive review of Yersiniosis in New Zealand was published by ESR staff in Pathogens in February 2021:


Note: Click on the document links below to open. These documents are in PDF format. You will need to download the free Adobe Acrobat Reader to view them.


2021 Yersinia Isolates



2021 Yersinia Isolates

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