Record Flu Season Hits Colorado Hard

Colorado is currently experiencing its most severe flu season on record. In the week ending December 27, 2025, the state reported 831 influenza hospitalizations, a historical high. While numbers slightly decreased the following week, they remain elevated.

The surge in cases is contributing to a national spike, with doctor visits for flu-like illness at a 30-year high. Physicians describe this year's strain as a "super flu" due to its rapid onset, contagiousness, and more severe symptoms, which can include vomiting and diarrhea, leading to increased emergency care demand.

This season's flu activity places Colorado among the top five states nationwide. The high volume of emergency department visits is attributed to both healthy individuals experiencing severe symptoms and those with underlying health conditions like asthma or heart disease, who face exacerbated complications.

Wastewater surveillance in Colorado indicates exceptionally high levels of influenza, significantly outnumbering RSV and COVID-19. This method provides a reliable indicator of community infection rates, as many individuals with mild symptoms do not seek formal testing or healthcare.

Despite the severity, health officials still recommend the annual flu shot, particularly for individuals with pre-existing medical conditions. While it may not prevent infection entirely, it can reduce symptom severity, duration, and the risk of hospitalization. Prompt medical attention is advised for severe symptoms like difficulty breathing or chest pain.