What's Going Around in California?

Health surveillance summary for California — April 2026

Here's a snapshot of current respiratory illness and disease activity in California, based on the latest CDC surveillance data. Click any topic for detailed trends, charts, and nearby state comparisons.

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Elevated Activity in California

Measles is at elevated levels. Tap below for details.

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Flu

Moderate

3.7% ILI

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RSV

Low

1.0 per 100K

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COVID-19

Low

0.5 per 100K

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Measles

High

20 cases in 2026

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MMR Coverage

Low

96.1% coverage

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What's Getting Better or Worse?

COVID-19 ↘ Likely Declining

Details →

Based on CDC forecasting data as of 2026-03-31.

Nearby States

Oregon Nevada Arizona

Cities in California

Health data available for these California cities:

Los Angeles ·San Diego ·San Jose ·San Francisco ·Fresno ·Sacramento ·Long Beach ·Oakland ·Bakersfield ·Anaheim ·Stockton ·Riverside ·Santa Ana ·Irvine ·Chula Vista ·Fremont ·Santa Clarita ·San Bernardino ·Modesto ·Moreno Valley ·Fontana ·Oxnard ·Huntington Beach ·Glendale ·Santa Rosa ·Elk Grove ·Ontario ·Rancho Cucamonga ·Oceanside ·Lancaster ·Garden Grove ·Palmdale ·Salinas ·Hayward ·Corona ·Sunnyvale ·Pomona ·Escondido ·Roseville ·Torrance ·Fullerton ·Visalia ·Orange ·Pasadena ·Victorville ·Santa Clara ·Thousand Oaks ·Simi Valley ·Vallejo ·Concord ·Berkeley ·Clovis ·Fairfield ·East Los Angeles ·Richmond ·Antioch ·Carlsbad ·Downey ·Costa Mesa ·Murrieta ·San Buenaventura (Ventura) ·Temecula ·Santa Maria ·West Covina ·El Monte ·Inglewood ·Burbank ·El Cajon ·San Mateo ·Jurupa Valley ·Daly City ·Rialto ·Norwalk ·Menifee ·Vacaville ·Chico ·Hesperia ·Vista ·Compton ·Carson ·San Marcos ·Arden-Arcade ·Mission Viejo ·Redding ·Santa Monica ·Tracy ·South Gate ·Chino ·San Leandro ·Westminster ·Hemet ·Indio ·Santa Barbara ·Hawthorne ·Livermore ·Citrus Heights ·Whittier ·Merced ·Lake Forest ·Newport Beach ·San Ramon ·Redwood City ·Buena Park ·Manteca ·Alhambra ·Lakewood ·Mountain View ·Folsom ·Tustin ·Milpitas ·Pleasanton ·Carmichael ·Rancho Cordova ·Napa ·Bellflower ·Upland ·Perris ·Chino Hills ·Alameda

Frequently Asked Questions

What's going around in California right now?

Based on the latest CDC data, here's what's circulating in California: flu activity is moderate, RSV is low, COVID-19 is low, and there have been 20 measles cases reported in 2026. Each topic page has detailed trends and comparisons.

Is the flu bad in California right now?

Flu activity in California is currently moderate with 3.7% ILI. Visit the California flu page for weekly trend charts, nearby state comparisons, and historical context.

Are there measles cases in California?

California has reported 20 confirmed measles cases in 2026. The state's kindergarten MMR vaccination rate is 96.1%. See the measles tracker for county-level details.

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.