Provisional Summary Report of Selected California Reportable Diseases

January - September 2025 (As of November 03, 2025)

This report displays the provisional number of selected communicable disease cases in California with estimated onset during the current year by month and local health jurisdiction (LHJ). Cases of these diseases are required to be reported to the local health authority and the California Department of Public Health (CDPH) according to Title 17, California Code of Regulations.

Data are not finalized and are subject to change. Please see Technical Notes for more information about data included in this report.

Navigation Guide
  • Click on tabs to see data by disease, month, and LHJ.
  • Scroll up/down and right/left to view full table content.
  • “SC” (Suppressed Count) values in tables mask small case counts to maintain confidentiality of case-patients in small populations.

Tables

Provisional Year-to-Date (YTD) Case Counts for Selected Diseases by Month of Estimated Onset Date: January - September 2025

Note: Estimated onset date is the date closest to the time when symptoms first appeared. (See Technical Notes)

Provisional Year-to-Date Case Counts for Selected Diseases by California LHJ: January - September 2025

Technical Notes

When interpreting the numbers in this report, please consider the following points:

  • Data in this report represent provisional disease case counts as of November 03, 2025. The time required to complete clinical, laboratory, and epidemiologic investigation for disease cases can vary and sometimes delay case reporting. Also, for some diseases, the criteria described below that must be met in order for a case to be counted as provisional are different than the finalized year-end case counting criteria. Thus, data in this report may differ from data presented in subsequent reports published.

  • Estimated onset date is the date closest to the time when symptoms first appeared. Since a date of onset may not be recorded, the estimated onset date can range from the date of first appearance of symptoms to the date the report was made to CDPH.

  • Year-to-Date (YTD) refers to the period from the beginning of the current year to the end of the specified month.

  • “SC” (Suppressed Count) designates case counts that have been suppressed due to small numbers based on Publication Scoring Criteria specified in California Department of Health Care Services (DHCS) Data De-identification Guidelines (DDG).

  • Coccidioidomycosis case counts in this report include only “Confirmed” cases and therefore will be lower than counts of combined provisional Suspect, Probable, and Confirmed cases published in the CDPH Provisional Valley Fever Dashboard.

  • Listeriosis case counts include reported cases of neonatal and non-neonatal listeriosis.

Cases are counted as “Provisional” if they meet the following criteria:

For cases reported with the following diseases, only those that met criteria for ‘Confirmed’ as specified in the surveillance case definition are included: Cholera, Coccidioidomycosis, Hantavirus Infection, Legionellosis, Malaria, Plague (human), Rabies (animal and human), and Viral Hemorrhagic Fevers (including Crimean-Congo, Ebola, Lassa, and Marburg viruses).

For cases reported with the following diseases, only those that met criteria for ‘Confirmed’ or ‘Probable’ as specified in the surveillance case definition are included: Anaplasmosis, Anthrax, Babesiosis, Botulism (foodborne, wound, and other), Brucellosis, Campylobacteriosis, Chikungunya Virus Infection, Ciguatera Fish Poisoning, Creutzfeldt-Jakob Disease and other Transmissible Spongiform Encephalopathies, Cronobacter (invasive infection among infants), Cryptosporidiosis, Cyclosporiasis, Cysticercosis or Taeniasis, Dengue Virus Infection, Domoic Acid Poisoning, Ehrlichiosis, Flavivirus Infection of Undetermined Species, Giardiasis, Hemolytic Uremic Syndrome (HUS) Without Evidence of Shiga toxin-producing E. coli (STEC), Hepatitis E (acute infection), Leprosy (Hansen’s Disease), Leptospirosis, Listeriosis (neonatal and non-neonatal), Lyme Disease, Melioidosis (B. pseudomallei infection), Paralytic Shellfish Poisoning, Paratyphoid Fever, Psittacosis, Q Fever, Relapsing Fever, Salmonellosis, Scombroid Fish Poisoning, Shiga Toxin-producing E. coli (STEC) without Hemolytic Uremic Syndrome (HUS), Shiga Toxin-producing E. coli (STEC) with Hemolytic Uremic Syndrome (HUS), Shigellosis (Groups A, B, C, D, and Unspecified), Spotted Fever Rickettsiosis, St. Louis Encephalitis Virus Infection, Trichinosis, Tularemia, Typhoid Fever, Typhus Fever, Vibrio Infection (non-Cholera), West Nile virus (neuroinvasive, non-neuroinvasive, and asymptomatic), Yellow Fever, Yersiniosis, and Zika Virus Infection.

For cases reported with the following diseases, only those closed by CDPH are included: Anthrax, Chikungunya Virus Infection, Cholera, Cysticercosis or Taeniasis, Dengue Virus Infection, Flavivirus Infection of Undetermined Species, Hantavirus Infection, Hemolytic Uremic Syndrome (HUS) Without Evidence of Shiga toxin-producing E. coli (STEC), Leptospirosis, Lyme Disease, Malaria, Plague (human), Psittacosis, Q Fever, Rabies (animal and human), Relapsing Fever, Shiga toxin-producing E. coli (STEC) with Hemolytic Uremic Syndrome (HUS), Spotted Fever Rickettsiosis, St. Louis Encephalitis Virus Infection, Trichinosis, Tularemia, Typhus Fever, Viral Hemorrhagic Fevers (including Crimean-Congo, Ebola, Lassa, and Marburg viruses), and Yellow Fever.

For cases reported with the following diseases, only those closed by the Local Health Department or CDPH are included: Anaplasmosis, Babesiosis, Botulism (foodborne, wound, and other), Brucellosis, Campylobacteriosis, Ciguatera Fish Poisoning, Coccidioidomycosis, Creutzfeldt-Jakob Disease and other Transmissible Spongiform Encephalopathies, Cronobacter (invasive infection among infants), Cryptosporidiosis, Cyclosporiasis, Domoic Acid Poisoning, Ehrlichiosis, Giardiasis, Hepatitis E (acute infection), Legionellosis, Leprosy (Hansen’s Disease), Listeriosis (neonatal and non-neonatal), Melioidosis (B. pseudomallei infection), Paralytic Shellfish Poisoning, Paratyphoid Fever, Salmonellosis, Scombroid Fish Poisoning, Shiga toxin-producing E. coli (STEC) without Hemolytic Uremic Syndrome (HUS), Shigellosis (Groups A, B, C, D, and Unspecified), Typhoid Fever, Vibrio Infection (non-Cholera), West Nile virus (neuroinvasive, non-neuroinvasive, and asymptomatic), and Yersiniosis.

For cases reported with Zika Virus Infection, only those closed by CDPH or ‘Closed to Surveillance-Open to Tracking’ are included.

If you have questions about this data report, please contact the CDPH Infectious Diseases Branch – Surveillance and Statistics Section at IDB-SSS@cdph.ca.gov.