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Abstract

Introduction

Despite vaccine availability, rotavirus persists as a leading cause of gastroenteritis in children younger than 5 years.

Aim

We aimed to evaluate temporal changes in rotavirus epidemiology in Belgium between 2009 and 2023, including the period of the COVID-19 pandemic.

Methods

We collected 8,024 rotavirus-positive stool samples throughout Belgium. For 6,352 samples, we determined the G and/or P genotypes through sequencing of the genes encoding the outer capsid proteins VP7 and VP4.

Results

Before the COVID-19pandemic, we received on average 622 samples per rotavirus epidemiological year, which decreased to 114 and 111 samples during the two pandemic rotavirus epidemiological years, followed by a peak of 1,048 samples in the first post-pandemic year. Notably, the proportion of cases in the age group 2–5-years increased from 20.3% before to 33% after the pandemic (p < 0.001). Over the 14-year study period, the most common genotypes were G2P[4], G3P[8] and G9P[8]. Post-pandemic data show an unusually strong dominance of the equine-like G3P[8] genotype which carried a DS-1-like genotype constellation in the period 2021 to 2023. Additionally, vaccinated individuals were significantly overrepresented among patients infected with the equine-like VP7 carrying G3P[8] rotavirus compared with other genotypes, including typical human VP7 G3P[8].

Conclusion

Despite the presence of typical yearly genotype fluctuations, several epidemiological changes were associated with the COVID-19 pandemic, including the unusual dominance of an emerging rotavirus strain against which current vaccines may be less effective. It is essential to closely monitor this strain to determine if the phenomenon is temporary.

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2025-03-27
2025-04-01
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14 years of rotavirus A surveillance: unusual dominance of equine-like G3P[8] genotype with DS-1-like genotype constellation after the pandemic, Belgium, 2009 to 2023
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Mustafa+Karata%C5%9F&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Karataş Mustafa</a>, <a href="/search?value1=Mandy+Bloemen&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Bloemen Mandy</a>, <a href="/search?value1=Lize+Cuypers&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Cuypers Lize</a>, <a href="/search?value1=Elke+Wollants&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Wollants Elke</a>, <a href="/search?value1=Marc+Van+Ranst&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Van Ranst Marc</a>, <a href="/search?value1=Jelle+Matthijnssens&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Matthijnssens Jelle</a></span>. 14 years of rotavirus A surveillance: unusual dominance of equine-like G3P[8] genotype with DS-1-like genotype constellation after the pandemic, Belgium, 2009 to 2023. <a href="/content/ecdc">Euro Surveill.</a> 2025;30(12):pii=2400442. <a href="https://doi.org/10.2807/1560-7917.ES.2025.30.12.2400442" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2025.30.12.2400442</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 05 Jul 2024;&nbsp;&nbsp; <span class="generated">Accepted</span>: 10 Jan 2025 </span> </p>
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