Increased circulation of GII.17 noroviruses, six European countries and the United States, 2023 to 2024.

Chhabra, PreetiWong, ShanNiendorf, SandraLederer, IngeborgVennema, HarryFaber, MirkoNisavanh, AthinnaJacobsen, SonjaWilliams, RachelColgan, AoifeYandle, ZoeGarvey, PatriciaAl-Hello, HaiderAmbert-Balay, KatiaBarclay, Lesliede Graaf, MirandaCelma, CristinaBreuer, JudithVinjé, JanDouglas, Amy2025-01-032025-01-032024-093932816210.2807/1560-7917.ES.2024.29.39.2400625https://rivm.openrepository.com/handle/10029/628013We 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.enGII.17GII.4NorovirusemergencegastroenteritisIncreased circulation of GII.17 noroviruses, six European countries and the United States, 2023 to 2024.ArticleEuro Surveill 2024;29(39):2400625