Following established seasonal patterns, cases and hospitalizations for influenza increased about tenfold from Q3 2025 (summer) to Q4 (fall), with the majority occurring in the last two weeks of the quarter entering the likely peak season of respiratory illness exposure in January and February. RSV cases also increased about fourfold, and hospitalizations doubled from Q3 to Q4. The majority of respiratory cases and hospitalizations in both Q3 and Q4 were due to COVID-19, also an established seasonal pattern, as the second late summer COVID-19 peak spanned both quarters. COVID-19 cases and hospitalizations were down slightly in Q4 compared to Q3 but also rose in the last few weeks of the quarter, going into the main winter peak. Across all three diseases, cases were up slightly (from 35 to 36 per 1000 residents) and hospitalizations approximately doubled (from 2 to 3 per 1000 residents) and are expected to further increase in the first quarter of 2026.