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Flu Hospitalizations Double as H3N2 Subclade K Drives Early U.S. Surge

Despite a partial mismatch, the current shot reduces severe illness.

Overview

  • CDC data through Dec. 20 estimates at least 7.5 million illnesses, 81,000 hospitalizations and 3,100 deaths so far this season.
  • More than 19,000 people were hospitalized in the latest reported week, roughly double the prior week as H3N2 subclade K dominates circulation.
  • High or very high influenza-like illness is now reported in roughly 29 to 32 jurisdictions, with Colorado, Louisiana, New Jersey, New York and South Carolina among the hardest hit.
  • New York recorded about 71,000 cases in a single week, its highest ever, and the national pediatric death toll has reached eight.
  • Hospitals in multiple states report growing strain, and officials urge vaccination, early antiviral treatment, masking in high-risk settings and staying home when sick.