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U.S. Flu Season Intensifies as H3N2 Subclade K Drives More Than 7 Million Cases

Low vaccination coverage leaves many vulnerable to severe illness.

Overview

  • CDC estimates now top seven million illnesses with about 81,000 hospitalizations and 3,100 deaths this season.
  • A(H3N2) subclade K is the predominant strain in U.S. surveillance, aligning with faster transmission seen in recent weeks.
  • New York reported roughly 71,000 lab‑confirmed cases in a single week, the highest since statewide mandatory reporting began in 2004.
  • Infectious‑disease experts caution the nation may not have reached the peak, with post‑holiday travel and gatherings expected to fuel additional spread.
  • Health authorities urge flu vaccination for everyone 6 months and older, prompt antivirals for high‑risk patients, and continued masking and hand hygiene in crowded indoor spaces.