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New Flu Strain Baffles Experts, Surges Nationwide
26 Feb
Summary
- Influenza B cases emerging alongside influenza A, expected to persist into spring.
- New H3N2 variant, Subclade K, has reduced population immunity and vaccine effectiveness.
- CDC ranks this season as high severity for children, with approximately 60 pediatric deaths.
Health experts are cautioning that the 2025-2026 flu season is extending beyond typical patterns, with expectations for the virus to remain prevalent well into the spring months.
The current season has seen influenza A cases present early and aggressively, a common trend. However, the emergence of influenza B cases in mid-February, alongside ongoing influenza A, is not unusual and is projected to continue.
A significant factor contributing to the season's intensity is a new influenza A H3N2 variant, Subclade K. This strain is particularly challenging due to limited prior population immunity and a nationwide decrease in flu vaccinations.
The effectiveness of the current vaccine against this specific variant has also been reduced. Consequently, the CDC has escalated the severity assessment to high for children, with approximately 60 pediatric deaths linked to Subclade K so far this year.
Experts emphasize that it is not too late to receive a flu vaccination, as it remains the most effective tool for reducing illness duration and severity, even with a less-than-perfect match. Flu symptoms, such as high fever, chills, and body aches, are distinct from seasonal allergies. Parents are urged to monitor children for persistent fevers and dehydration, supporting recovery with rest, hygiene, hydration, and nutrition.
