What's Going Around in Illinois?
See the strongest statewide signal first, then open the next page that answers the real question.
Fast answer
What matters first in Illinois
Illinois is showing very low overall respiratory activity right now, first available ari week in the current local snapshot. Flu is low and similar to 0.9% last week, RSV is moderate and similar to 2.7 per 100k last week, and Illinois has reported 3 measles cases in 2026.
MMR coverage gap is the main signal worth checking first.
Strongest current signal
Vaccination gap
91.8% coverage
Spread signal
CDC ARI + statewide disease surveillance
Refresh
Weekly for respiratory topics
Best use
Fast statewide answer before deeper detail
Flu
Low0.8% ILI
→ Stable — similar to 0.9% last week
View details →RSV
Moderate2.6 per 100K
→ Stable — similar to 2.7 per 100K last week
View details →COVID-19
Moderate1.6 per 100K
↓ Decreasing — down from 2.1 per 100K last week
View details →Measles
Moderate3 reported cases this year
Use case count plus vaccination context together.
View details →MMR Coverage
High91.8% coverage
Long-run prevention signal, not a weekly spread metric.
View details →Sendable statewide snapshot
What's going around in Illinois right now
LowBuilt to be the one page you can forward to family, schools, travelers, or coworkers who need the fast statewide answer.
If you need one link to send about Illinois, this is the right statewide snapshot. It starts with the broad respiratory picture, then routes into flu, RSV, COVID-19, measles, and vaccination detail.
- Flu: 0.8% ILI
- RSV: 2.6 per 100K
- Measles: 3 reported cases this year
Useful questions
Questions worth opening from the Illinois overview
These pages help when the statewide snapshot is useful but you need one more layer of interpretation, sharing guidance, or measles context before sending someone deeper.
Sharing Question
What Page Should I Send Someone Who Asks What’s Going Around?
A utility page for sharing the right LHS link the first time instead of sending a random dashboard or article.
Measles Interpretation
Should I Worry About a Single Measles Case in My State?
A trust-preserving measles interpretation page that helps users react proportionately and click into the right state page next.
ARI Question
What Does High Respiratory Activity Mean?
A simple explanation of the ARI signal, built to route people into the right next disease page instead of leaving them with an abstract label.
Pilot: overall respiratory activity
Overall respiratory illness activity in Illinois
Overall respiratory illness activity in Illinois is very low this week. This broad CDC ARI signal uses respiratory-related emergency department visits, so it is best for a fast statewide read before drilling into flu, RSV, or COVID-19 detail.
Intensity
Very Low
Week ending
Mar 28, 2026
Direction
first available ARI week in the current local snapshot
Want the methodology? See our CDC ARI source page.
What's Getting Better or Worse?
Based on CDC forecasting data as of 2026-03-31.
Source and context
Where this statewide view comes from
Updated
May 29, 2026
Coverage
Statewide surveillance across overall respiratory activity, flu, RSV, COVID-19, measles, and MMR
Best For
Fast statewide snapshot before drilling into a topic page
This overview combines multiple public-health feeds for Illinois. It is best for getting the quickest cross-topic picture, while the disease-specific pages provide deeper charts, methodology, and comparisons.
Useful local shortcuts
Pages to open next in Illinois
If the statewide overview is not enough, these Illinois pages give you a faster path into the local or illness-specific answer.
Nearby States
Cities in Illinois
Health data available for these Illinois cities:
Frequently Asked Questions
What's going around in Illinois right now?
Overall respiratory activity is very low in Illinois right now. Here is the fast statewide read for Illinois: flu activity is low, RSV is moderate, COVID-19 is moderate, and Illinois has reported 3 measles cases in 2026. Each topic page goes deeper when you need the detail.
Is the flu bad in Illinois right now?
Flu activity in Illinois is currently low with 0.8% ILI. Visit the Illinois flu page for weekly trend charts, nearby state comparisons, and historical context.
Are there measles cases in Illinois?
Illinois has reported 3 measles cases in 2026. The state's kindergarten MMR vaccination rate is 91.8%. See the measles tracker for county-level details and local-health-department guidance if you need outbreak-specific information.
Local Health Signal is not affiliated with the CDC or any government agency. Data is provided for informational purposes only and is not intended for clinical decision making. See our methods page for details on data sources and limitations.