Flu Season Begins Early: Experts Warn of H1N1 Mutation
This year's flu season is off to an early start, driven by a mutated H1N1 strain. Experts urge vaccinations amidst rising cases.
As October unfolds, many are taken aback to learn that flu cases are emerging earlier this year, well before Halloween. The 2026-2027 flu season appears to be picking up intensity. Although flu activity remains low across the United States, many regions—particularly in the western states—are seeing a rapid increase in infections.
According to the U.S. Centers for Disease Control and Prevention (CDC), as of October 21, flu infections are surging or likely surging in 44 states. Two states, Louisiana and Hawaii, are already experiencing moderate flu activity. Traditionally, flu cases begin to rise during this time; however, this season's surge began as early as August.
Understanding the Current Flu Landscape
The predominant strain of influenza this season is Influenza A H1N1, a significant departure from last winter's dominant H3N2 subclade K, often referred to as the
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