CDC classifies 2025–26 flu season as ‘moderately severe’ as estimates reach 11 million illnesses

U.S. health officials are warning that influenza activity remains elevated in the 2025–26 season, with the Centers for Disease Control and Prevention classifying the season as “moderately severe” based on surveillance indicators. The updated assessment follows a rise in cases through late December and underscores concerns about continued transmission in the weeks ahead.

CDC estimates for the season to date put the toll at at least 11 million illnesses, around 120,000 hospitalizations, and roughly 5,000 deaths. Those estimates, compiled from multiple surveillance streams, highlight the burden the virus can place on hospitals and communities even outside pandemic conditions—especially during winter travel and indoor gatherings.

Public health experts have pointed to several drivers of the surge, including holiday travel, lower vaccination uptake in some communities, and persistent misinformation that can reduce willingness to vaccinate or to take early precautions. The CDC has also indicated that flu activity is expected to continue for several more weeks, meaning additional pressure on clinics and emergency departments remains possible.

Strain makeup matters for risk planning. Influenza A(H3N2) has been reported as the dominant subtype among subtyped influenza A cases, a detail that can influence how public health teams think about severity patterns across different age groups and the likelihood of outbreaks in schools and long-term care settings.

Health officials continue to emphasize practical steps: vaccination for those who have not yet received a flu shot, early testing and treatment for high-risk patients, and common-sense protections such as staying home when sick and improving indoor ventilation. As the season develops, weekly surveillance updates will guide local decision-making on staffing, hospital capacity, and community messaging.

• CDC status: 2025–26 flu season classified as “moderately severe.”
• Estimated burden so far: at least 11M illnesses, 120K hospitalizations, 5K deaths.
• Outlook: Elevated activity expected to continue for several weeks.