New data shows Key Updates on US Influenza Activity for Week 51 Ending December 20, 2025

The Centers for Disease Control and Prevention (CDC) released the Weekly US Influenza Surveillance Report for week 51, ending December 20, 2025, providing critical insights into the current flu season. The report highlights a noticeable increase in influenza activity across multiple regions of the United States, with Influenza A viruses predominating. Hospitalization rates have risen, particularly among older adults and young children, emphasizing the importance of vaccination during peak flu season. The CDC continues to monitor flu strains closely to inform vaccine effectiveness and public health strategies. Influenza-like illness (ILI) activity has also experienced a significant uptick, signaling heightened disease transmission. Public health officials recommend taking preventive measures, including receiving the flu vaccine, practicing good hygiene, and seeking medical care if flu symptoms develop. This report serves as a key resource for healthcare providers, policymakers, and the public to understand ongoing influenza trends and prepare accordingly.

Centers for Disease Control and Prevention | CDC (.gov)

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