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California Influenza Reports 2024-25

Commonground

Senior Moderator
Update for September 27, 2024
Website: https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/Respiratory-Viruses/RespiratoryDashboard.aspx

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CDPH Weekly Respiratory Virus Report
NOTE: Weeks 51 and 52 of the Respiratory Virus Report will not be published on December 27, 2024 and January 3, 2025, respectively, due to holidays. Reporting will resume for Week 1 on January 10, 2025.​


The last report:

Respiratory Virus Weekly Report
Week 50: December 08 – December 14, 2024​

Excerpts:

Laboratory Surveillance
COVID-19
The overall percentage of SARS-CoV-2 detections from results received through electronic laboratory reporting (ELR) during the
week ending December 14, 2024 was 2.3% compared to 2.1% during the week ending December 07, 2024.​

Influenza
The overall percentage of influenza detections in clinical sentinel laboratories during the week ending December 14, 2024 was 13.2%
compared to 9.4% during the week ending December 07, 2024.​

Respiratory Syncytial Virus (RSV)
The overall percentage of RSV detections in clinical sentinel laboratories during the week ending December 14, 2024 was 7.6%
compared to 6.7% during the week ending December 07, 2024.​

https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/RespiratoryVirusReport.aspx
 
Weekly Respiratory Virus Report

​This report shows statewide, weekly data for the following illnesses:
  • COVID-19
  • Influenza
  • Respiratory Syncytial Virus (RSV)
The weekly Respiratory Virus Report updates most Fridays.

The 2024-2025 respiratory virus season covers June 30, 2024 through June 28, 2025.

The data is reported early and may change in future reports as more information becomes available.


This report doesn’t cover all areas of California, so it might not represent the entire state’s public health situation.​​​

Week 1: December 29, 20​24 - January 04​, 2025: Data Snapshot

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Key Messages​
  • Influenza activity is high. RSV activity is moderate. COVID-19 activity is low.​​
  • The majority of positive influenza specimens are type A with both H1 and H3 strains ​circulating.
  • CDPH data show that only a small percentage of eligible Californians have received the appropriate
    respiratory virus vaccines. The updated COVID-19 vaccine is expected to work well against current
    circulating variants including XEC.

    With elevated respiratory virus activity, now is the time to take added precautionsto prevent disease spread, especially if you have risk factors for severe disease. Get vaccinated, protect yourself from serious illness, and reduce strain on our healthcare system. Updated COVID-19 and influenza vaccines are still available. Visit the CDC’s RSV vaccination webpage for information about preventing RSV infection. Talk to your healthcare provider today.
For the most up to date information on bird flu, please see the bird f​lu w​ebpa​​ge​​.

continued: https://www.cdph.ca.gov/Programs/CI...-Virus-Report/RespiratoryVirusReportWeek1.pdf
 
Respiratory Virus Weekly Report
Week 2: January 05, 2025 – January 11, 2025​ Data Snapshot

Screenshot 2025-01-19 at 5.49.04 AM.png


Key Messages​
  • Influenza activity is high. RSV activity is moderate. COVID-19 activity is low.​​
  • The majority of positive influenza specimens are type A with both H1 and H3 strains ​circulating.
  • CDPH data show that only a small percentage of eligible Californians have received the appropriate
    respiratory virus vaccines. The updated COVID-19 vaccine is expected to work well against current
    circulating variants including XEC.
​Continued: https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/RespiratoryVirusReport.aspx
 
Week 3: January 12, 20​25 - January 18​, 2025: Data Snapshot

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Key Messages​
  • Influenza activity continues to be high. RSV activity is moderate but decreasing. COVID-19 activity
    continues to be low.
  • The majority of positive influenza specimens are type A with both H1 and H3 strains circulating.
    Influenza type B represents a small minority of positive specimens (<5%).
  • CDPH data show that only a small percentage of eligible Californians have received the appropriate
    respiratory virus vaccines.
Continued: ​https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/RespiratoryVirusReport.aspx
 
February 1, 2025
Where is flu surging in the US? Some hospitals are overwhelmed in states with high rates

Excerpt:

California is also being hit hard. San Diego in particular is seeing a steady rise in flu cases and hospitalizations, Dr. Francesca Torriani, an infectious disease specialist at UC San Diego Health, tells TODAY.com. Compared to this time last year, flu-related emergency department visits are nearly double that of last year in San Diego County, she says.

Also in San Diego, Sharp Chula Vista Medical Center has deployed a temporary tent outside their emergency department to triage and treat low-risk patients in response to high volumes of patients with flu symptoms. The hospital is seeing about 15-20 flu patients per day in the tent, which helps open the availability of beds in the ER for other health concerns, Sharp HealthCare tells TODAY.com.

https://www.yahoo.com/news/flu-activity-high-most-us-084035718.html
 
Quartet of viruses overwhelm Calif. city EDs
February 2, 2025
Fresno EDs see an increase in visits due to respiratory viruses

FRESNO, Calif. — A quartet of illnesses is “overwhelming and overloading” Fresno -area emergency rooms as respiratory virus season reaches its peak in California, medical experts said.

“Community Health System is currently experiencing high patient numbers that are stretching our emergency department capacity at Clovis Community Medical Center as well as Community Regional Medical Center in downtown Fresno,” the health care company said in a statement released on Monday, Jan 24.
-snip-
Medical professionals usually treat about 330 patients a day at Community Regional Medical Center, according to Dr. Thomas Utecht, an emergency medicine physician at the Fresno hospital.
Staff are currently seeing about 400 patients each day, Utecht said Monday, an increase of 17.5%.

​-snip-

“There are basically four major viruses (that) ... are leading to a lot of the infections affecting Fresno -area residents,” Banh said.

According to Banh, three of those viruses are respiratory: COVID-19, influenza and respiratory syncytial virus.

Locals are also dealing with norovirus, he said.

Also known as the stomach flu, it’s a “very contagious” virus that causes acute gastroenteritis, an inflammation of the stomach or intestines, the Centers for Disease Control and Prevention said.

An increase in cases involving these viruses — dubbed the “quad-demic” by medical experts — is responsible for the influx of patients in Fresno -area emergency rooms.

“It’s a mixture of everything coming in, and it’s overwhelming and overloading some of the emergency departments,” Banh said, leading to an increase in patient visits and “a lot of backlog for people being seen.”

...https://www.ems1.com/public-health/quartet-of-viruses-overwhelm-calif-city-eds



 
Fourth teenager dies from flu in San Diego County: report

Posted: Feb 14, 2025 / 12:02 PM PST
by: Amber Coakley

SAN DIEGO (FOX 5/KUSI) — Another local teen has died from the flu, marking the fourth teen this year to succumb to virus complications, the San Diego County Health Department confirmed Thursday.

According to FOX 5/KUSI’s reporting partners at The San Diego Union-Tribune, “a 16-year-old from coastal North County died Feb. 2 after he became infected with type-A flu.” It was also reported that the teen had other health conditions present at the time of his passing.

Like the other three county teenagers who died from the flu, this teen had also not received a vaccine during the most recent flu season, the county health department confirmed to The San Diego Union-Tribune.​ ...

https://fox5sandiego.com/news/local-news/fourth-teenager-dies-from-flu-in-san-diego-county-report/
 
Week 6: February 02, 20​25 - February 08, 2025: Data Snapshot

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Key Messages​
  • Influenza activity remains high. RSV activity is low and decreasing. COVID-19 activity is low.
  • The majority of positive influenza specimens are type A with both H1 and H3 strains circulating.
    Influenza type B represents a small minority of positive specimens (<5%).
  • CDPH data show that only a small percentage of eligible Californians have received the appropriate
    respiratory virus vaccines.
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https://www.cdph.ca.gov/Programs/CI...-Virus-Report/RespiratoryVirusReportWeek6.pdf
 
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