Flu Shot Performance Hits Low Point This Year

The latest data from health officials reveals that the flu vaccine provided limited protection this winter.

Protection Rates

• Adults: Only about 25% of vaccinated adults avoided serious illness requiring a doctor visit or hospital stay.
• Children: Vaccinated children had a slightly better outcome, with roughly 40% fewer clinic visits.

The Culprit: A New Strain

A new strain of the flu virus, H3N2 subclade K, spread rapidly in late December. This strain did not match the vaccine’s design, leading to many vaccinated individuals still contracting the flu.

Seasonal Impact

• Total Cases: Approximately 27 million cases reported this season.
• Hospital Admissions: Around 350,000 admissions.
• Deaths: Roughly 22,000 fatalities, including at least 100 children, most of whom were not fully vaccinated.

Vaccination Rates

• Adults: Vaccination rates climbed to about 46%, a slight increase from last year.
• Children: The rate was close to 50%, still below the earlier target of 52%.

Future Plans

The World Health Organization (WHO) and the U.S. Food and Drug Administration (FDA) have selected strains for the 2026-27 vaccine, including subclade K, to improve match and effectiveness.

Expert Advice

Despite the limited protection this season, experts emphasize that vaccination remains valuable. It reduces the risk of severe illness and death.