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California Influenza Season 2025/26

Commonground

Commonground

Senior Moderator
California Respiratory Virus Dashboard

What to Know
  • In California, the amount of combined respiratory illness (Influenza (flu), RSV, and COVID-19) causing people to seek health care is very low.
  • SARS-CoV-2 wastewater levels are rapidly decreasing and are now classified as low.
  • Get vaccinated today for flu, RSV, and COVID-19.
  • Visit My Turn - California Vaccine Scheduling Site to schedule your vaccine today.
  • For 2025-2026 respiratory virus vaccine information, visit CDPH Public Health for All.
  • Stay home if you’re feeling sick, cover your cough, and wash your hands to avoid spreading illness.
Updated 10/3/2025​​


​​About the Dashboard

Many respiratory viruses, including flu, RSV and COVID-19 circulate year-round in the United States. Some viruses are more active from October through March, such as the flu and RSV among many others.

The California Respiratory Virus Dashboard shows statewide and regional, weekly respiratory virus data. It provides an overview of activity and severity for flu, RSV and COVID-19. The data updates most Fridays. This may change in the future as more information becomes available. Refer to the How to Navigate the Dashboard section for guidance on utilizing and understanding the dashboard features.

CDPH monitors:
  • Positive tests data from those who seek healthcare
  • Emergency department visits for respiratory viruses
  • Hospitalization rates for flu, RSV and COVID-19
  • Vital records data of deceased individuals from these diseases
  • Presence of respiratory viruses in wastewater
This information allows CDPH to:
  • Identify changes in disease patterns
  • Identify level of viruses, if present
[click on image to enlarge]
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How to Navigate the Dashboard ​
  • Select a tab at the top to see:
    • An overview
    • Test positivity
    • Flu typing
    • Emergency department (ED) visits
    • Hospital admissions
    • Deaths or pediatric deaths
  • In the overview tab, select your region. to determine the level of respiratory illness causing people to seek healthcare.
    • To determine which region your county is in, go to the Regional Public Health Office page.
    • On our overview page of the dashboard, you can also select a condition and see the levels for all the regions of California for:
      • Test positivity
      • New admissions
      • Wastewater concentrations
    • ​​Hover over a region to see the level and value for each metric.
  • Definitions of test positivity and hospital admissions levels can be seen in the table below. For wastewater level information, see the California Wastewater Surveillance Dashboard.
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  • ​For the test positivity, ED visits, hospital admissions, and deaths tabs, there are two figures.
    • The top figure compares all three conditions for the current season. The bottom figure you can select the condition and view data for the past three seasons.
    • ​​On the hospital admissions tab there are only two seasons due to changing reporting requirements.
    • ​​Season is defined as Morbidity and Mortality Weekly report (MMWR) week 27 through week 26 of the following year.
    • ​These weeks are usually at the end of June or beginning of July.
  • Using the drop down to the left of each multi-season figure, values can be filtered by:
    • Condition
    • Region
    • Age
    • Date Display Options*
  • When filtering, if you deselect all options on the Region and Age filters, the figure still shows the values for selecting all.
  • The flu-typing page only has a figure for the current season. It has the same filtering options as the multi-season figures, except condition. This tab only has influenza data.
  • The ED visits page does not include filters for region and age.
  • ​The pediatric deaths page has one figure with all conditions and multiple seasons with no additional filters.

* The date format for the x-axis of the figures can be changed to display the MMWR week, week-ending date, or month.

MMWR is a Centers for Disease Control and Prevention (CDC) report that provides critical updates on public health concerns. It’s typically used by public health professionals, researchers, policymakers and healthcare providers for decision-making on public health threats.

The MMWR week date format allows for a more straightforward comparison to CDC’s report. When selecting the monthly option for date display options, values are averaged for the entire month, even if the current month hasn’t ended.​

https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/RespiratoryVirusReport.aspx

​
 
Last edited:
CDPH Calls on Dairy Operators to Offer On-site Flu Vaccine Clinics

​OCTOBER 14, 2025​

SACRAMENTO, Calif. — In a letter to diary operators from Kristin J. Cummings, MD, Chief of the Occupational Health Branch, the California Department of Public Health (CDPH) calls on owners and operators of California dairies to offer on-site flu vaccine clinics for employees working with dairy cows. CDPH cites potential benefits of less absenteeism, with less accompanying loss of productivity and revenue. The letter goes on to acknowledge that while seasonal flu vaccines do not protect employees avian flu (H5N1) infection from infected dairy cows, and notes that flu vaccinations could reduce the likelihood of simultaneous infection with seasonal flu and H5NI; some have speculated this poses a risk of development of a new, more dangerous flu variant.

Dr. Cummings letter suggests the possibility of working with local health departments, some of which offer low- or no-cost flu vaccines, providing vouchers for employees to receive vaccines at local pharmacies or clinics, and offering time off to employees to receive the flu vaccine.

CDPH also offers resources to assist with H5N1 testing and access vaccine clinics.

https://www.morningagclips.com/cdph-calls-on-dairy-operators-to-offer-on-site-flu-vaccine-clinics/
​
 
San Diego County
Respiratory Virus Surveillance Report
Data through 10/25/2025
​
COVID-19, Influenza, and RSV Season-to-Date Overview

Screenshot 2025-10-31 at 2.54.32 PM.png

... https://www.sandiegocounty.gov/cont...SDC_Respiratory_Virus_Surveillance_Report.pdf
​
 
LA County Public Health confirms first flu death of the season

​November 19, 2025


The Los Angeles County Department of Public Health confirmed the first flu death of the season.

Public health officials said the person was older, had underlying conditions and did not receive a flu vaccine.
​
"We send our condolences to the family and loved ones of the person we lost. This tragic death reminds us how serious influenza can be," said Dr. Muntu Davis, LA County Health Officer. "The best protection this season is getting an updated flu vaccine."
-snip-
According to Public Health, there were 334 flu-related deaths in LA County during 2024-2025, excluding Long Beach and Pasadena, which have their own public health departments. Long Beach reported 22 flu-related deaths.

https://www.cbsnews.com/losangeles/...ealth-confirms-first-flu-death-of-the-season/
 
Riverside County reports first flu-related death of the season
Published November 20, 2025​ -- UPDATED today at 12:09 PM​


RIVERSIDE, Calif. (KESQ) - Riverside County reported its first influenza-related death of the 2025-26 flu season.

The person was identified as an individual who was over 65 and from Western Riverside County, and is not believed to have been vaccinated.
-snip-
​ According to Riverside University Health System – Public Health (RUHS – PH), current data, including emergency department statistics, hospitalizations and wastewater testing, show influenza activity is low in Riverside County.​

Screenshot 2025-11-20 at 4.18.58 PM.png


Historic trends show flu season could ramp up through the Thanksgiving and winter holiday travel season.

https://kesq.com/news/2025/11/20/riverside-county-reports-first-flu-related-death-of-the-season/
 
California Respiratory Virus Dashboard

​Note: The Respiratory Virus Dashboard will not be updated on November 28, 2025 due to the holiday. Reporting will resume on December 5, 2025.​​

Updated 11/21/25
  • ​Seasonal influenza activity is rising, particularly in the Bay Area and Southern California. Hospitalizations are currently low but are expected to increase. CDPH continues to recommend influenza vaccination, testing, and timely treatment.
  • A new H3N2 flu strain (subclade K) is causing severe early flu seasons in the Northern Hemisphere. Current influenza vaccines continue to offer protection, especially against severe disease.
  • RSV activity is increasing in California, especially among children. Hospitalizations are currently low but are expected to increase. Immunizations are recommended for all eligible persons.
  • COVID-19 activity remains very low statewide, with minimal test positivity, emergency room visits, and hospitalizations. CDPH continues to recom​mend COVID-19 vaccination, especially for those at increased risk and for all who choose protection.
  • Vaccines are available in California. Talk with your doctor or visit MyTurn to schedule your vaccine appointment today.

Hospital Admissions
Screenshot 2025-11-22 at 7.41.53 AM.png

Deaths
Screenshot 2025-11-22 at 7.44.07 AM.png

https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/RespiratoryVirusReport.aspx
 
Riverside County Reports First Flu-Related Death of 2025 Season

​November 21, 2025

Riverside County has confirmed its first flu-related death of the 2025 season. Health officials say the victim was a 65-year-old resident from Western Riverside County who had not received a flu shot—something they emphasize could significantly reduce the risk of severe illness or hospitalization.

While current flu activity across the county remains low, experts warn that numbers typically climb following Thanksgiving. Only 16% of residents have been vaccinated so far, a rate significantly lower than previous years.

Officials also note that other respiratory illnesses, including RSV, are beginning to peak as winter approaches. Vaccines for RSV are available for older adults, pregnant individuals in their third trimester, and young children entering their first or second RSV season.

continued: https://www.nbcpalmsprings.com/2025...V2OPmqQ3DPTk-0Xvu5_aem_0RpO5ue67MgMdc3i40c6hQ

​
 
Child dies from flu in Sacramento County, first death of 2025-26 season
December 23, 2025

A child in Sacramento County has died from complications related to influenza, marking the county’s first flu-related death of the 2025-26 season, public health officials disclosed Tuesday. The child had no underlying health conditions, according to county officials, and had died from Influenza A, the most common strain of the virus. They did not release the child’s age and said it was not known if the child had received a flu shot.

Read more at: https://www.sacbee.com/news/local/health-and-medicine/article313925429.html#storylink=cpy​
 
San Mateo County Health Confirms Influenza-Related Pediatric Death
January 7, 2026

San Mateo County Health is reporting the influenza (flu)-related death of an adolescent patient in December. The patient had not received this year’s flu shot, and it is not known if there were underlying health conditions. This is the second flu-related death in San Mateo County this season.
-snip-

The Bay Area is currently seeing an increase in flu-related activity. In San Mateo County, two of the main indicators of flu activity – emergency department visits and test positivity – are at levels consistent with previous years but are rising. For the week of December 21-27, 2025, there were 314 flu-related emergency department visits, an increase of 98 from the previous week. Test positivity was 15.4 percent, an increase of 20 percent from the previous week.

In San Mateo County, 18 influenza-related deaths of persons under 65 were recorded in 2024-25 and 9 deaths were recorded in 2023-24.
​
... https://www.smcgov.org/ceo/news/san-mateo-county-health-confirms-influenza-related-pediatric-death

​
 
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