The CDC reports that flu activity in the United States continues to increase, with nearly 5 million illnesses, 49,000 hospitalizations, and 1,900 deaths so far this season. The latest surveillance for week 49 ending December 6, 2025, indicates that 8.1% of clinical lab tests are positive for influenza, predominantly influenza A(H3N2). The most common circulating strain is influenza A(H3N2), with a new subclade K identified, which has small genetic changes that slightly reduce vaccine effectiveness but still offer protection against severe illness. Outpatient visits for respiratory illness are up to 3.2%, above the baseline, with activity levels varying across regions, and some areas experiencing moderate to high activity. Hospitalization rates are rising, especially among older adults, with a weekly rate of 6.9 per 100,000 and a cumulative rate of 6.9 per 100,000. CDC estimates over 4.6 million illnesses, 30,000 hospitalizations, and 1,200 deaths nationally. Pediatric deaths have increased, with three reported so far this season, including two this week. Vaccination efforts continue, with over 127 million doses distributed, but flu vaccine effectiveness may be impacted by the circulating drifted strains. Experts emphasize that vaccination remains crucial, especially as flu activity ramps up during the holiday season. The season's severity is comparable to previous years, despite media claims of an