Syphilis epidemic
In 2023, there were 20 cases of congenital syphilis (parent to child transmission) in King County; a 67% increase from 2021. This preventable disease can cause devastating harm to infants. Syphilis cases have also risen among cisgender women and men who have sex with women, while remaining high among gay, bisexual, and other men who have sex with men. Rates are low (about 3%) among transgender and non-binary people.
Public Health — Seattle & King County formed a Syphilis Task Force to review real time syphilis data and guide public health interventions. For the most accurate information, refer to the Annual STI Epidemiology Reports.
Syphilis: An Accelerating Epidemic
All-stage syphilis among cisgender men who have sex with men (MSM), cisgender men who have sex with women (MSW), and cisgender women, King County, Washington 2014-2023.
Syphilis cases by stage, King County, WA | |
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December 2024 (820 KB) | May 2024 (818 KB) |
November 2024 (823 KB) | April 2024 (821 KB) |
October 2024 (825 KB) | March 2024 (819 KB) |
September 2024 (828 KB) | February 2024 (821 KB) |
August 2024 (824 KB) | January 2024 (878 KB) |
July 2024 (824 KB) | December 2023 (822 KB) |
June 2024 (805 KB) |
2024 Syphilis testing guidelines for cisgender women (including pregnant individuals) and cisgender men who have sex with women*
- Sexually active individuals aged 45 and under who have not been tested since January 2021 should get tested for syphilis.
- Sexually active individuals should test annually and whenever they get medical care (up to every 3 months) if they: (1) use injection drugs (2) use methamphetamine or nonprescription opioids (3) are houseless or unstably housed (4) have transactional sex (5) entered a correctional facility or have been incarcerated in the last 2 years (6) had syphilis or gonorrhea in the last 2 years (7) are living with HIV and are sexually active outside of a mutually monogamous relationship (8) are a woman whose male partners have sex with both men and women (9) have a sex partner with any of the above risk factors for syphilis.
- Pregnant individuals should be tested during their: (1) first prenatal care visit (2) 3rd-trimester [laboratory testing done during the 24th-28th week of pregnancy] (3) time of delivery.
- Pregnant individuals who have not had prenatal care, or their prenatal care status is unknown, should be tested any time they are in a clinical setting (i.e., emergency department, jail, substance use treatment facilities, OB triage, labor and delivery, etc.)
*Syphilis testing guidelines for other populations can be found in the 2024 Syphilis Screening Guidelines (431 KB)
Resources
- Syphilis facts (136 KB)
- Syphilis is Rising posters (10.7 MB)
- Syphilis is rising for women and pregnant people (207 KB)
- Syphilis is Rising campaign
- Syphilis facts, CDC
For medical providers
Syphilis guidelines and resources for healthcare providers are available on our resources for medical providers page.