The flu is surging across the U.S.

Flu is surging across the U.S. at a faster-than-usual pace, with hospitalizations nearly doubling in a single week and young children among those hit hardest — and doctors warn the season is nowhere near peaking, according to experts at George Washington University.

New CDC data show flu activity at “high” or “very high” levels in 32 states, up from just 17 the week before. Since October, at least 7.5 million people have been sickened, more than 19,000 have been hospitalized, and roughly 3,100 have died, including a growing number of children.

Influenza A(H3N2) viruses are the most frequently reported flu viruses this season, according to USA Today.

Among the states with the highest levels of flu activity are Colorado, Louisiana, South Carolina, New Jersey and New York, according to the CDC.

Subclade K (previously called A(H3N2) virus subclade J.2.4.1) is a mutation of influenza A H3N2. Influenza A is typically the virus associated with the term “flu” and has evolved into many different strains over time.

Each year, the seasonal flu shot is formulated to target the strains most commonly circulating. One of those, H3N2, has been present for decades, according to the CDC and the Gavi Vaccine Alliance. Still, its most recent mutation is different enough that the vaccine targeting H3N2 for the 2025-2026 season is not as effective against it.

Doctors and health professionals are recommending that everyone 6 months and older get vaccinated against influenza during the flu season because the symptoms overlap with those of COVID-19. Your immune system may be weakened by one infection, leaving you more vulnerable to others.

The Gayly online. 01/05/2026 @ 12:43 p.m. CST.