Infectious Diseases by Disease, County, Year, and Sex

These data contain case counts and rates for selected communicable diseases—listed in the data dictionary—that met the surveillance case definition for that disease and was reported for California residents, by disease, county, year, and sex. The data represent cases with an estimated illness onset date from 2001 through the last year indicated from California Confidential Morbidity Reports and/or Laboratory Reports. Data captured represent reportable case counts as of the date indicated in the “Temporal Coverage” section below, so the data presented may differ from previous publications due to delays inherent to case reporting, laboratory reporting, and epidemiologic investigation.

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Additional Info

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Field Value
Contact Email [email protected]
Program California Department of Public Health/Center for Infectious Diseases/Division of Communicable Disease Control/Infectious Diseases Branch/Surveillance and Statistics Section
Homepage URL https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/IDB.aspx
Temporal Coverage

The data represent case counts as of July 31, 2023 and the coverage years include 2001 thru 2022. For some conditions, fewer years of data are available, as detailed in the data dictionary.
Spatial/Geographic Coverage

California
Geographic Granularity County
Language English (EN)
Frequency Annually
De-Identification Method

Cells are suppressed if the calculated score from the Publication Scoring Criteria published in https://www.dhcs.ca.gov/dataandstats/Documents/DHCS-DDG-V2.0-120116.pdf is greater than 12.
Source Link https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/SSS.aspx
Data Collection Tool

California Confidential Morbidity Reports and/or Laboratory Reports that were submitted to the California Department of Public Health through the California Reportable Disease Information Exchange (CalREDIE) as well as unique county developed systems.
License Terms of Use
Limitations Use of this data is subject to the CHHS Terms of Use and any copyright and proprietary notices incorporated in or accompanying the individual files.
Additional Limitations

The numbers of cases reported for some diseases may underestimate the true magnitude of disease. Among factors that can contribute to under-reporting are delays in notification, limited collection or inappropriate testing of specimens, obstacles or impediments to ill persons seeking health care, limited resources and competing priorities in LHDs, and incomplete reporting by clinicians and laboratories. Among factors that can enhance efficiency of disease reporting are disease severity, infrequent or rare occurrence of the condition, the availability of new or less expensive diagnostic tests, expansion of criteria that define a case, recent media attention or public interest, and active surveillance activities.
Related Resources

The State of California, Department of Finance Annual Intercensal Population Estimates by Race/Ethnicity with Age and Gender Detail were used to generate population values covering years 2001–2009. The State and County Projections were used to generate population values covering years 2010—2022.
Citation

California Department of Public Health, Center for Infectious Diseases, Infectious Diseases Branch, Surveillance and Statistics Section, 2001-2022. Infectious-Diseases-by-Disease-County-Year-Sex.csv
Last Updated November 6, 2023, 22:01 (UTC)