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Respiratory Viruses Healthcare Professionals Hub

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Respiratory Viruses in California

​​CDPH tracks and monitors respiratory virus disease trends through various methods. CDPH analyzes the number of positive tests from those who seek healthcare and are tested to identify changes in disease patterns. CDPH monitors hospitalization rates for COVID-19, influenza, and RSV throughout California and compiles death data from these diseases by looking at vital records.

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Respiratory Viruses Information for Healthcare Professionals

​Many respiratory viruses, including COVID-19, circulate year-round in the United States and California. Some viruses are more active from October through March, such as influenza (flu), respiratory syncytial virus (RSV), and many others. 

While seasons fluctuate, flu, RSV, and COVID-19 cause hundreds​ of thousands of hospital admissions and tens of thousands of deaths each year in the United States. 

Stay up to date about what’s circulating in the community and talk to your patients about core strategies for prevention of respiratory virus infections​. ​

Respiratory Virus Core Prevention Strategies for Healthcare Professionals​​

Latest Resources​​​

  • 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.
  • 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 recommend 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. 

Updated 11/21/25​​​​​​​​​
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