Flu
3.5% this week
down 0.2 points from last week
Flu is moderate in California. similar to 3.7% last week. 0.9 percentage points above the national average.
Open the flu page →Weekly state update
What Changed in California This Week?
The fastest statewide answer to “what actually changed?” in California. This page compresses the weekly public-health movement first, then routes you into the deeper pages only when you need them.
This week in one screen
California: what changed first
HighBuilt for repeat checks, fast forwarding, and not having to re-open the whole site tree.
California this week: Measles remains the main statewide watchout in California, with 20 reported cases in 2026. Flu is moderate at 3.5%, down 0.2 points from last week. RSV is low at 1.0 per 100K, down 0.3 per 100K from last week.
- Flu: 3.5% this week — down 0.2 points from last week
- RSV: 1.0 per 100K this week — down 0.3 per 100K from last week
- COVID-19: 0.5 per 100K this week — roughly flat versus last week
- Measles: 20 total cases in 2026 — Cases have been reported in 2026.
- Vaccination context: California kindergarten MMR coverage is 96.1%.
Signal-by-signal
What moved this week
Use this page for the fast weekly change log, then open the deeper page only when needed.
RSV
1.0 per 100K this week
down 0.3 per 100K from last week
RSV is low in California. similar to 1.3 per 100K last week. 1.0 per 100K below the national rate.
Open the rsv page →COVID-19
0.5 per 100K this week
roughly flat versus last week
COVID-19 is low in California. similar to 0.6 per 100K last week. 0.7 per 100K below the national rate.
Open the covid-19 page →Measles
20 total cases in 2026
Cases have been reported in 2026.
California has reported 20 measles cases in 2026. Cases have been reported in 2026. Latest report date: 2026-04-06.
Open the measles page →Next clicks
Where to go after the weekly update
California overview
Best next click if you want the whole statewide picture, not just the change log.
Open the measles page
Best next click if the main watchout on this page is the real reason you came.
Travel to California
Best next click if this week’s update is really about a trip, event, or family visit.
Open the weekly roundup
Best next click if you want the national version first and then your place-specific page.
Useful questions
Questions that help after the California weekly update
These pages work well when the change log is useful but you need one more layer of interpretation or sharing guidance before you leave the weekly update flow.
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.
Major cities
Useful city pages to open next
Los Angeles
Open the city overview, then jump into flu, RSV, or measles if those are the real questions.
San Diego
Open the city overview, then jump into flu, RSV, or measles if those are the real questions.
San Jose
Open the city overview, then jump into flu, RSV, or measles if those are the real questions.
San Francisco
Open the city overview, then jump into flu, RSV, or measles if those are the real questions.
This week nationally
The broader sendable version
Weekly Roundup
What's Going Around Right Now? Early April 2026 Weekly Update
A quick weekly snapshot of what is going around in the US right now: flu is still circulating but falling, COVID-19 remains moderate, RSV is tapering off, and measles is still the outbreak story to watch.
Flu
3.5% this week
RSV
1.0 per 100K this week
COVID-19
0.5 per 100K this week
Measles
20 total cases in 2026
Open the weekly roundup →
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.
Source and context
How this page is built
Updated
Apr 10, 2026
Coverage
California statewide change summary across flu, RSV, COVID-19, measles, and MMR context
Best For
Fast weekly change checks, repeat visits, and forwarding one state update
This page is a change-log layer, not a replacement for the deeper state and topic pages. It is strongest when you want the quick weekly movement first and the more detailed chart or outbreak page second.