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Volume 31, Number 7—July 2025

Research Letter

Increasing Predominance of Norovirus GII.17 over GII.4, United States, 2022–2025

Leslie Barclay and Jan VinjéComments to Author 
Author affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

Main Article

Figure 1

Increase in outbreaks of norovirus GII.17 over GII.4, United States, 2022–2025. Seasons are defined as September 1 of one year to August 31 of the next. The 2024–25 season is truncated to September 2024–April 2025. Other genotypes: GI.1, GI.2, GI.3, GI.4, GI.5, GI.6, GI.7, GII.1, GII.2, GII.3, GII.6, GII.7, GII.8, GII.10, GII.12, GII.13, GII.14, GII.21, GII.27, and GIX.1.

Figure 1. Increase in outbreaks of norovirus GII.17 over GII.4, United States, 2022–2025. Seasons are defined as September 1 of one year to August 31 of the next. The 2024–25 season is truncated to September 2024–April 2025. Other genotypes: GI.1, GI.2, GI.3, GI.4, GI.5, GI.6, GI.7, GII.1, GII.2, GII.3, GII.6, GII.7, GII.8, GII.10, GII.12, GII.13, GII.14, GII.21, GII.27, and GIX.1.

Main Article

Page created: May 23, 2025
Page updated: June 25, 2025
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The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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