Increased circulation of GII.17 noroviruses, six European countries and the United States, 2023 to 2024
Preeti Chhabra, Shan S. Wong, Sandra Niendorf, I Lederer, Harry Vennema, Mirko Faber, Athinna Nisavanh, Sonja Jacobsen, Rachel Williams, Aoife Colgan, Zoe Yandle, Patricia Garvey, Haider Al‐Hello, Katia Ambert‐Balay, Leslie Barclay, Miranda de Graaf, Cristina Celma, Judith Breuer, Jan Vinjé, Amy Douglas
Abstract
We report an increase in GII.17 norovirus outbreaks and sporadic infections of acute gastroenteritis in Austria, Germany, France, Ireland, the Netherlands, England and the United States during the 2023/24 season. A decrease in GII.4 coincided with GII.17 prevalence increasing to between 17% and 64% of all GII detections. Overall, 84% of the GII.17 strains clustered closely with strains first reported in Romania in 2021 and two new sub-lineages were identified. Norovirus surveillance and molecular characterisation should be prioritised this winter.