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The Viral Threat Hiding in Plain Sight: Between August 2024 and July 2025, the CDC’s NoroSTAT system recorded 2,675 norovirus outbreaks across the United States. A genetic shift has emerged: the GII.17 strain has overtaken the long-dominant GII.4 lineage , now responsible for roughly 75 percent of reported cases . Health officials warn this strain replacement increases outbreak frequency and severity, as current cleaning and immunity defenses are quickly becoming outdated. Why It Matters