Findings We analysed 16 635 norovirus sequences submitted between Jan 1, 2005, to Nov 17, 2016, of which 1372 (8·2%) sequences belonged to genotype GI, 15 256 (91·7%) to GII, and seven (<0·1%) to ...

Norovirus GII.17 accounted for < 10% of outbreaks in the US 2022-23 season, but rose to 75% during the 2024-25 season, passing the number of GII.4 outbreaks.

Prevention of vertical transmission of HBV is an important goal, as this type of transmission is a major cause of new infections and is associated with an increased risk of progression to liver ...

In previous years, the U.S. saw norovirus outbreaks increase around December, which marked the start of the season of the virus. Between 2011 and 2024, GII.4 viruses caused less than 50% of US ...

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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.