The Flu Strengthens at the End of 2025

We are closing out 2025 with rising flu levels this winter. Influenza is on the rise in the United States, with activity primarily driven by influenza A (H3N2), and there has been an increase in cases (4.6 million), hospitalizations (49,000), and 1,900 deaths. These numbers, however, are typical for the winter season, according to the Centers for Disease Control and Prevention (CDC).

But specialists are warning about a more aggressive variant, known as subclass K, which could intensify infections and complications. CDC surveillance data show that flu activity is increasing overall, though the timing of this increase is not markedly different from that of past seasons. Experts in this field affirm that vaccination remains recommended to reduce risks.

What are its most common symptoms, and who is at greatest risk and should prioritize vaccination?

Ricardo Correa, spokesperson for the American Medical Association (AMA) in Ohio, explained on Linea Avierta that “we are in a temperature transition, and we know that right now the temperatures outside are dropping, and this causes us to congregate more in enclosed spaces, where the spread of respiratory viruses is much easier… In the fall and winter, the peaks of influenza and respiratory illnesses were recorded, according to CDC records.”

The full audio for this news piece is only available in Spanish.

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