Flu season begins early with H1N1 dominance and West Coast surge

Public health officials are reporting an unusually early start to the influenza season across the Northern Hemisphere. In the United States, activity is rising earlier than typical, with the surge notably driven by the West Coast rather than the South. Surveillance data from the UK and Japan also indicate higher-than-expected positive test rates for this time of year.

Scientists are monitoring a shift in dominant strains, noting that H1N1 currently accounts for approximately 96 percent of subtyped cases in some regions. There are also concerns regarding an emerging G155E mutation within the H1N1 subtype. Additionally, some reports indicate that the H1N1 strain has drifted from the version targeted by current vaccines.

Health experts, including representatives from the CDC and various medical societies, recommend that individuals—especially high-risk groups such as seniors, young children, and those with chronic conditions—receive their vaccinations as soon as possible. Experts suggest getting vaccinated by late September or October to ensure protection is established before the winter peak.