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virus4d linkDuring 2011–2025, GII.4 viruses have caused >50% of US outbreaks each season (defined as September 1 of one year through August 31 of the next) . Laboratory surveillanceDuring 2011–2025, GII.4 viruses have caused >50% of US outbreaks each season (defined as September 1 of one year through August 31 of the next) . Laboratory surveillance