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.

Annual Reports

2019–2020 
PDF | Excel

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

2014–2015 | 2013-2014​ | 2012–2013  | 2011–2012 

2010–2011 | 2007–2008 | 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. ​​