FLU ACTIVITY REACHES 25-YEAR HIGH

AS HOSPITALS FACE NATIONWIDE STRAIN

The United States is experiencing one of its most severe influenza seasons in decades, with national surveillance data showing flu activity at levels not seen in roughly 25 years. The outbreak—frequently described in media coverage as a “super flu” season—has spread rapidly and broadly across the country, driving unusually high rates of illness, hospitalization, and death.

The term “super flu” is not a medical classification. Still, it reflects the extraordinary intensity of the current season, which is being driven overwhelmingly by influenza A (H3N2), specifically the rapidly spreading H3N2 subclade K. According to virologic surveillance from the Centers for Disease Control and Prevention, more than 90 percent of subtyped influenza A viruses this season are H3N2, with subclade K accounting for the vast majority of analyzed samples. Historically, H3N2-dominant seasons are associated with higher hospitalization and mortality rates, and the current season is following—and in some respects exceeding—that pattern.

CDC surveillance indicators show that outpatient visits for influenza-like illness, emergency department admissions, laboratory-confirmed flu cases, and hospitalizations have all climbed into the agency’s highest severity tiers. The CDC currently classifies more than 30 states as “very high” for flu activity, signaling sustained and widespread transmission rather than isolated regional outbreaks. Millions of Americans are estimated to have been infected so far this season, with well over 100,000 hospitalizations and thousands of deaths, including confirmed pediatric fatalities.

What distinguishes this season from many past outbreaks is the simultaneous nationwide surge. Instead of peaking region by region, flu activity has risen sharply across much of the country simultaneously. This has limited healthcare systems' ability to shift resources or rely on regional relief, accelerating pressure on emergency departments, inpatient units, and pediatric hospitals. Health systems in multiple states report early activation of surge protocols as flu admissions climb and bed availability tightens.

Pediatric hospitals have raised particular concern, reporting unusually high numbers of severe flu cases among children—another hallmark of intense H3N2 seasons. In some areas, flu-related hospitalizations have reached levels comparable to or exceeding the most severe seasons of the past two decades, straining staffing and capacity during the winter peak.

Taken together, the aggressive spread of the H3N2 subclade K, its rapid nationwide dominance, and the sustained elevation of severe outcomes explain why this season is being characterized as a “super flu” event. The CDC continues to warn that flu activity may remain elevated for weeks, with the season still unfolding.

Although influenza is often viewed as a routine seasonal illness, the 2025–2026 outbreak shows how quickly flu can escalate into a nationwide public health emergency. With transmission remaining high, health officials urge people to take basic precautions: staying home when sick, avoiding close contact with others if symptoms develop, practicing good hand hygiene, and seeking medical care promptly if illness becomes severe—especially for children, older adults, and those with underlying conditions. Small, practical steps can help reduce the risk of complications and ease pressure on healthcare systems as the season continues.

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