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New variant of the flu virus is driving surge of cases across the US and Canada

By Zachary W. Binder, Associate Professor of Pediatrics, UMass Chan Medical School

After a sharp uptick in flu cases in mid-December 2025, flu activity across the U.S. and Canada remains high.

Although cases are trending downward in Canada as of Jan. 9, 2026, the season has yet to peak in the U.S., according to data from the Centers for Disease Control and Prevention.

As…

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