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Abstract

Epidemiological data have indicated that invasive infections caused by the Gram-positive cocci (group A streptococcus, GAS) have increased in many Australian states over the past two decades. In July 2022, invasive GAS (iGAS) infections became nationally notifiable in Australia via public-health agencies. Surveillance for infections has been sporadic within the state of New South Wales (NSW). This has led to a lack of genetic data on GAS strains in circulation, particularly for non-invasive infections, which are the leading cause of GAS’s burden on the Australian healthcare system. To address this gap, we used whole-genome sequencing to analyse the genomes of 318 . isolates collected within two geographical regions of NSW. Invasive isolates were collected in 2007–2017, whilst non-invasive isolates were collected in 2019–2021. We found that at least 66 different -types were associated with clinical disease within NSW. There was no evidence of any Australian-specific clones in circulation. The M1 variant of the global pandemic clone (M1) has been detected in our isolates from 2013 onwards. We detected antimicrobial-resistance genes (mainly , or genes) in less than 10 % of our 318 isolates, which were more commonly associated with non-invasive infections. Superantigen virulence gene carriage was reasonably proportionate between non-invasive and invasive infection isolates. Our study adds rich data on the genetic makeup of historical infections within Australia. Ongoing surveillance of invasive and non-invasive GAS infections within NSW by whole-genome sequencing is warranted to inform on outbreaks, antimicrobial resistance and vaccine coverage.

Keyword(s): group A streptococcus
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2024-01-10
2024-12-06
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