VTEC Isolates 2018

Monday 19th August 2019


Summary

VTEC/STEC confirmations continue to increase as another two laboratories commenced culture independent testing for this organism in January and November 2018. Thus more than 75% of clinical samples in New Zealand are now being screened routinely for stx genes.

The 10 most common STEC O types confirmed in 2018 were: O157, O26, O128, O146, O38, O123/186, O103, O174, O176, and O91.

Note: the USA "Top 7" serotypes only include O157, O26 and O103 from NZ's top 10. However, some of NZ's common types are being regularly seen elsewhere in the world.

stx2+ STEC O26 continues to emerge as a significant pathotype with 15 isolates confirmed in 2018.

The number of samples from which an organism has not been able to be isolated is similar to 2017, and, comprehensive typing is not currently possible without a pure culture isolate. Work to improve organism isolation is ongoing and the upcoming introduction of routine WGS will add to our understanding of this group of organisms.

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VTEC Isolates 2018

 

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VTEC Isolates 2018

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