The Centers for Disease Control and Prevention has released its Sexually Transmitted Disease Surveillance 2012 report. Statistics for some diseases are broken down by metropolitan area.
The San Diego metro area (the county) did poorly in some diseases. For example, San Diego had 526.2 incidents of chlamydia per 100,000 population — higher than the U.S.'s 481.1. Chladmyia cases for both men and women are more than the national average per 100,000 population. The disease is “the most frequently reported bacterial sexually transmitted infection in the United States,” according to the Centers for Disease Control and Prevention website.
San Diego did slightly better than the nation in syphilis cases of all stages; however, cases of primary and secondary syphilis reported were 10.5 per 100,000 population in the county, higher than the national average of 7.2. Men's syphilis in San Diego was worse than the national average, but women's syphilis was slightly less.
The county's gonorrhea numbers were not so striking, with 83.4 cases per 100,000, versus the nation's 121.5. Gonorrhea cases for both men and women in San Diego were less than the national average.