What's Going Around Right Now? April 2026 Illness Update

What’s Going Around in April 2026?

Here’s the national picture for respiratory illnesses as of the first week of April 2026.

Flu: Declining, But Not Gone

Flu season is winding down nationally with the ILI rate at moderate levels. Most states are past their peak, but some — particularly in the South and Midwest — still have elevated activity.

States still seeing flu activity:

• Louisiana | Alabama | Illinois | Kentucky
• Hawaii | Rhode Island

When will flu season end? We wrote about the 2025-2026 flu timeline this week.

See the full national flu map for every state.

Measles: Over 600 Cases and Growing

This is the biggest public health story right now. Over 600 confirmed measles cases across 30 states make 2026 the worst measles year in decades.

Check your state on our measles tracker and see our April outbreak update.

The root cause: 39 states have MMR vaccination rates below the 95% herd immunity threshold.

COVID-19: Moderate and Stable

COVID-19 hospitalizations remain moderate nationally. Activity is stable with no signs of a major spring surge.

Track your state: COVID-19 dashboard

RSV: Season Ending

RSV season is effectively over for most of the country, with low hospitalization rates across nearly all states. A few southern states may see lingering activity.

Current data: RSV dashboard

Check Your State

Enter your state on our homepage or browse the full state list to see all five health metrics in one place.

What to Do

• Flu: If you haven’t been vaccinated this season, it’s not too late — flu is still circulating
• Measles: Verify your MMR vaccination status — most people need two doses
• COVID: Stay current on boosters if you’re in a high-risk group
• Stay informed: We update all data weekly from CDC sources

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Updated weekly. Last update: April 3, 2026. See our March update for comparison.