The Illinois Department of Public Health Seasonal Respiratory Illness dashboard shows flu, COVID-19, and RSV cases are all trending higher with flu activity leading the way at the "very high" level for the week ending December 27, 2025; followed by COVID-19 activity at a moderate level and RSV activity at a low level.
IDPH reports 8.2% of Emergency Department visits were due to the flu, and about 30% of hospital admissions for acute respiratory cases were children between the ages of 5 and 17.
According to IDPH, only 1 in 5 people in Illinois got a flu shot and only 5% got the updated COVID-19 vaccine.
Nationally, the Centers for Disease Control and Prevention estimates there have been at least 7.5 million illnesses, 81,000 hospitalizations, and 3,100 deaths from the flu so far this season.