What is causing the current flu surge in the US and Canada?

The current flu surge is primarily caused by a new strain of influenza known as subclade K.

Are children more at risk from this year's flu strain?

Yes, this year's flu strain, subclade K, is affecting children more severely, leading to higher rates of hospitalization and complications.

When is the peak of flu season in North America?

Flu season in North America typically peaks between December and February.

Home / Health / Superflu Alert: Kids Hit Hardest by New Strain

Superflu Alert: Kids Hit Hardest by New Strain

16 Jan

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Summary

New flu strain subclade K is driving a North American surge.
Children are experiencing severe symptoms and hospitalizations.
Flu activity remains high in the U.S. as the season peaks.

Superflu Alert: Kids Hit Hardest by New Strain

Flu activity remains elevated across the U.S. and Canada in early January 2026, primarily driven by a newly identified subtype, subclade K. While Canada is seeing a downward trend, the U.S. season has yet to peak, with many states reporting high or very high flu activity. This surge is characterized by unprecedented numbers of doctor and emergency department visits for flu symptoms.

The current flu season has seen a concerning impact on children, who are experiencing more severe symptoms and hospitalizations than in previous years. This includes prolonged high fevers and complications like febrile seizures and dehydration. As of January 9, 2026, 17 pediatric deaths due to flu had been reported in the U.S. this season.

Health officials recommend flu vaccination, noting that while the vaccine's match to subclade K may not be perfect, it still offers protection against severe illness. For those feeling unwell, public health guidance emphasizes staying home until fever-free for 24 hours and practicing frequent handwashing to mitigate the spread of this highly contagious variant.