New H3N2 Flu Strain Surges in US, Hits Older Adults Harder

• US flu cases are rapidly climbing, with hospitals reporting increased visits, faster than expected for winter.
• A dominant H3N2 influenza A strain is circulating, historically linked to more severe illness, especially in older adults.
• The flu season has not yet peaked, but the Northeast, including New York, is experiencing a significant surge.
• Vaccines were finalized before H3N2 emerged, raising concerns about the match, but still reduce severe outcomes.
• Despite CDC estimates of 4.6M illnesses and 1.9K deaths, vaccination rates remain modest, partly due to hesitancy.

Why It Matters: Flu cases are rising, driven by H3N2, urging vaccination despite potential vaccine mismatch.