These data contain case counts and rates for sexually transmitted diseases (chlamydia, gonorrhea, and early syphilis which includes primary, secondary, and early latent syphilis) reported for California residents, by disease, county, year, and sex.

Data were extracted on cases with an estimated diagnosis date from 2001 through the last year indicated, from California Confidential Morbidity Reports and/or Laboratory Reports that were submitted to CDPH by July of the current year and which met the surveillance case definition for that disease. Because of inherent delays in case reporting and depending on the length of follow-up of clinical, laboratory and epidemiologic investigation, cases with eligible diagnosis dates may be added or rescinded after the date of this report.