November, 2025

The respiratory virus isolation rates in October remained largely consistent with those observed in September, indicating stable levels of overall virus activity across the two months. Notably, SARS-CoV-2 detections dropped by a little over 50%, suggesting a significant decline in COVID-19 circulation during this period.

Typically, respiratory syncytial virus (RSV) peaks in the late fall or early winter months, often around November to December. Influenza activity generally begins to rise in late fall or early winter, with peak levels commonly occurring between December and February, though flu season can sometimes extend into March or early spring.

Now well into the fall season, we are in the height of the vaccination period for both influenza and COVID-19. These vaccines remain essential tools for reducing the severity of illness, preventing hospitalizations, and helping to control the spread of these highly transmissible respiratory viruses. Widespread vaccination not only protects individuals but also strengthens community immunity—an especially important factor as we move into the peak months for respiratory virus circulation.

Refer to www.cdc.gov/coronavirus/2019-ncov for the most recent updates.

Ordering information available here: https://depts.washington.edu/uwviro/.

View the UW Virology COVID-19 Dashboard for up to date testing numbers.

Follow the area’s epidemiological data each week on the UW Virology web site at https://depts.washington.edu/uwviro/respiratory-viral-epidemiology-data/.

 

Community detections: October, 2025

PCR Positives: