Should You Get Flu Shot Now? What We Know About This Year’s Dominant Virus

Key Points:

• Health officials in the U.S. are urging Americans to get vaccinated against the flu as early-season influenza activity, including hospitalizations and positive tests, has risen sharply, reaching the highest hospitalization rate for this time of year since 2010-11.
• The CDC reports that nearly all flu viruses circulating are H1N1, a descendant of the 2009 swine flu strain, with no detection yet of the more severe H3N2 subclade seen last year; researchers continue to monitor viral evolution and potential impacts on the season's severity.
• Flu activity varies by state, with Louisiana and Hawaii experiencing moderate influenza-like illness levels, while several others show low or minimal activity; colder weather may accelerate transmission in the coming weeks.
• The CDC recommends annual flu vaccination for everyone aged 6 months and older, emphasizing that vaccines are widely available and that early vaccination remains the best protection against severe disease and hospitalization.
• Flu season typically peaks in winter, and health officials will closely watch ongoing trends to determine if this early rise signals an unusually severe season or a temporary increase in cases.