This new variant wasn’t included in this year’s flu shots because it was identified after scientists had chosen the four strains to include this year.
Health experts are sounding the alarm as a new influenza A (H3N2) subclade K variant drives an unusually early and aggressive flu season. The strain, first noted in Asia and Australia, is now spreading rapidly across the United States, Canada, and Europe, leading to surging cases and hospitalizations weeks ahead of typical seasonal patterns.
What’s Happening
- The Centers for Disease Control and Prevention (CDC) reported an 8.1% rise in positive flu tests nationwide in early December, with activity already surpassing epidemic thresholds in several regions.
- States in the Northeast and inland West are seeing particularly high case counts, with hospitals reporting increased admissions for severe respiratory illness.
- The World Health Organization (WHO) has also confirmed that this variant is linked to more severe disease outcomes, raising global concern.
Why This Variant Is Different
- Genetic changes in the virus have made it more transmissible and harder for the immune system to fight off.
- Symptoms appear to be more intense than typical flu strains, with patients reporting prolonged fevers, severe muscle aches, and respiratory complications.
- While the current flu vaccine may not be a perfect match, experts emphasize that it still offers significant protection against severe illness and hospitalization.
What You Can Do
- Get vaccinated: Even partial protection can reduce the risk of severe outcomes.
- Practice hygiene: Frequent handwashing, masking in crowded spaces, and staying home when sick remain effective defenses.
- Monitor symptoms: Seek medical attention if flu-like symptoms escalate, especially for vulnerable groups such as older adults, young children, and those with chronic conditions.
The Bottom Line
This year’s flu season is shaping up to be one of the most challenging in recent memory, with the subclade K variant fueling early and severe outbreaks worldwide. Public health officials urge vigilance, vaccination, and preventive measures to curb its impact.
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