Molecular epidemiology and evolution of norovirus in Australia and New Zealand, 2018 to 2020

A continued high prevalence of GII.4 Sydney 2012 [P16] was observed (NSW: 23.0%; NZ: 24.2%), albeit co-dominant with GII.2 [P16] (NSW: 20.2%; NZ: 29.4%). Unlike the historical trends, the GII.4 Sydney 2012 capsid has been in circulation for eight years. Circulating norovirus in the community was disrupted by COVID-19 control measures; lockdowns reduced viral concentration in wastewater by >90% (1.4 × 10<sup>5</sup> genome copies (gc)/L) from May to September 2020 compared to equivalent timeframes in 2018 (1.6 × 10<sup>6</sup>gc/L) and 2019 (1.9 × 10<sup>6</sup>gc/L). The relaxation of lockdown measures in late-2020 coincided with a strong resurgence of GII.2[P16] prevalence both clinically and in wastewater in NSW and Melbourne, accompanied by a decline in the diversity of circulating noroviruses. Conclusion: In summary, COVID-19 disrupted the strain diversity and levels of norovirus in Australia and New Zealand.

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Publication Details

Journal
Infectious Diseases
Published
2025-03-18
DOI
https://doi.org/10.1080/23744235.2025.2479133
Citations
1
Primary Topic
Viral gastroenteritis research and epidemiology
Type
article
Field-Weighted Citation Impact
1.40

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article

Molecular epidemiology and evolution of norovirus in Australia and New Zealand, 2018 to 2020

Dawn Croucher, Joanne Hewitt, Alice Russo, Peter G. Huntington et al.
1 citations
Infectious Diseases
Viral gastroenteritis research and epidemiology
1.40
article

Molecular epidemiology and evolution of norovirus in Australia and New Zealand, 2018 to 2020

Dawn Croucher, Joanne Hewitt, Alice Russo, Peter G. Huntington, Emma Fay Harding, William D. Rawlinson, Peter A. White, Lewis K Mercer, Grace J. H. Yan, Jason M. Mackenzie
article en
1 citations

Abstract

A continued high prevalence of GII.4 Sydney 2012 [P16] was observed (NSW: 23.0%; NZ: 24.2%), albeit co-dominant with GII.2 [P16] (NSW: 20.2%; NZ: 29.4%). Unlike the historical trends, the GII.4 Sydney 2012 capsid has been in circulation for eight years. Circulating norovirus in the community was disrupted by COVID-19 control measures; lockdowns reduced viral concentration in wastewater by >90% (1.4 × 10<sup>5</sup> genome copies (gc)/L) from May to September 2020 compared to equivalent timeframes in 2018 (1.6 × 10<sup>6</sup>gc/L) and 2019 (1.9 × 10<sup>6</sup>gc/L). The relaxation of lockdown measures in late-2020 coincided with a strong resurgence of GII.2[P16] prevalence both clinically and in wastewater in NSW and Melbourne, accompanied by a decline in the diversity of circulating noroviruses. Conclusion: In summary, COVID-19 disrupted the strain diversity and levels of norovirus in Australia and New Zealand.

Infectious DiseasesVol. 57(8)
New South Wales Department of Health (AU), The University of Melbourne (AU), UNSW Sydney (AU), Peter Doherty Institute (AU), Prince of Wales Hospital (AU), New Zealand Institute for Public Health and Forensic Science (NZ)
Ministry of Health, New Zealand, National Health and Medical Research Council
Good health and well-being
Openalex Percentile: Top 23%
Viral gastroenteritis research and epidemiology
1.40
DOIOpen Access PDFOpenAlex
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Molecular epidemiology and evolution of norovirus in Australia and New Zealand, 2018 to 2020 — Dawn Croucher, Joanne Hewitt, et al. · Infectious Diseases (2025) | TGRS Research Map | TGRS