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California Department of Public Health (CDPH) Influenza Surveillance Program 

Historic Influenza and Other Respiratory Disease Surveillance Reports

The California Department of Public Health (CDPH) Influenza Surveillance Program (CISP) is a collaborative effort between CDPH, the Centers for Disease Control and Prevention (CDC), Kaiser Permanente, California local health jurisdictions and the participating California sentinel providers and sentinel laboratories. Influenza surveillance in California is particularly important due to its coastal location with several ports of entry for flights and shipping from Asia. Annual influenza epidemics follow a winter seasonal pattern in the United States with typical activity peaking during late December to early February. CDPH obtains and analyzes clinical, and laboratory data year-round in an effort to determine the timing and impact of influenza activity and to determine how well circulating strains of the virus match those used in the current influenza vaccines.

 (All links are PDF files, some are 1 MB or larger.ā€‹ā€‹)

Annual Reports

2019ā€“2020 
PDF | Excel

2018ā€“2019 | 2017-2018 | 2016-2017  | 2015ā€“2016 

2014ā€“2015 | 2013-2014ā€‹ | 2012ā€“2013  | 2011ā€“2012 

2010ā€“20112007ā€“2008 | 2006ā€“2007  |  2005ā€“2006  

2004ā€“2005 | 2003ā€“2004 | 2002ā€“2003  | 2001ā€“2002 

2000ā€“2001 | 1999ā€“2000

Surveillance Reports

Reports (PDF) and data tables (Excel) are archived by week ending date. ā€‹ā€‹

2023ā€“2024 Season
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2021ā€“2022 Season

 2019ā€“2020 Season

The final report of the 2019-20  influenza season was for the week ending March 21, 2020.
 2018ā€“2019 Season

       

 2016ā€“2017 Season
 2014ā€“2015 Season
 2012ā€“2013 Season
 2010ā€“2011 Season
 2008ā€“2009 Season
2022ā€“2023 Season
2020ā€“2021 Season
 2017ā€“2018 Season
 2015ā€“2016 Season
 2013ā€“2014 Season

The final report of the 2013-14 influenza season was for the week ending March 15, 2014.

 2011ā€“2012 Season
 2009ā€“2010 Season
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