Division of Communicable Disease Control

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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 4: January 19, 2025 - January 25, 2025: Data Snapshot

View the full report below the key messages.

Metric	COVID-19	Flu	RSV
Test Positivity (change)	2.4% (0.0)	26.3% (3.0)	5.7% (-0.7)
New Admissions Rate per 100,000 Persons (change)	2.2 (-0.1)	9.5 (0.9)	N/A
Percent of Total Deaths (change)	1.5% (1.0)	2.4% (1.0)	0.0% (-0.3)
Total Season Pediatric Deaths* (new)	3 (0)	10 (3)	2 (0)
Wastewater Concentrations (trend)	MEDIUM (PLATEAUING)	N/A	N/A

*Refer to pediatric deaths data notes section.

Key Messages

Influenza activity is high and increasing. 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.

This year’s respiratory virus season has been dominated by seasonal influenza. See CDC’s Preliminary Estimated Flu Disease Burden 2024-2025 Flu Season.

With elevated respiratory virus activity, now is the time to take added precautions to 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 flu webpage.

Full Respiratory Virus Report

Week 4: January 19, 2025 - January 25, 2025 (PDF)

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Previous Respiratory Virus Reports

2024 – 2025 Season

Week 40: September 29 - October 05, 2024 (PDF)
Week 41: October 6-12, 2024 (PDF)
Week 42: October 13-19, 2024 (PDF)
Week 43: October 20-26, 2024 (PDF)
Week 44: October 27 - November 02, 2024 (PDF)
Week 45: November 3-9, 2024 (PDF)
Week 46: November 10-16, 2024 (PDF)
Week 48: November 24-30, 2024 (PDF)
Week 49: December 1-7, 2024 (PDF)
Week 50: December 8 - 14, 2024 (PDF)
Week 1: December 29, 2024 - January 04, 2025 (PDF)
Week 2: January 5-11, 2025 (PDF)
Week 3: January 12-18, 2025 (PDF)

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Division of Communicable Disease Control

Weekly Respiratory Virus Report

Week 4: January 19, 20​25 - January 25, 2025: Data Snapshot

​View the full report below the key messages.

Full Respiratory Virus Report

Previous​​ Respiratory Virus Reports

​2024 – 2025 Season

Week 4: January 19, 2025 - January 25, 2025: Data Snapshot

View the full report below the key messages.

Previous Respiratory Virus Reports

2024 – 2025 Season