Skip Navigation LinksFlu-Reports

immunization branch

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)

Annual Reports

PDF | Excel

2018-2019 | 2017-2018 | 2016-2017  | 2015-2016 

2014-2015 | 2013-2014 | 2012-2013  | 2011-2012 

2010-20112007-2008 | 2006-2007  |  2005-2006  

2004-2005 | 2003-2004 | 2002-2003  | 2001-2002 

2000-2001 | 1999-2000

Surveillance Reports

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

2020-2021 Season
 2019-2020 Season

The final report of the 2019-20  influenza season was for the week ending March 21, 2020.
 2017-2018 Season
 2015-2016 Season
 2013-2014 Season

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

 2011-2012 Season
 2009-2010 Season
2021-2022 Season

 2018-2019 Season


 2016-2017 Season
 2014-2015 Season
 2012-2013 Season
 2010-2011 Season
 2008-2009 Season
Page Last Updated :