Multilevel Drivers of Congenital Syphilis, Oregon, 2013 to 2021

Background: Despite the availability of curative penicillin treatment for syphilis during pregnancy, congenital syphilis (CS) cases have surged in the United States, including in Oregon.

Methods: We conducted a retrospective analysis of individual- and county-level predictors of CS among pregnant people with syphilis in Oregon from 2013 to 2021. Data were collated from surveillance reports, County Health Rankings, and other sources with upstream county-level data. We used multilevel Poisson regression models to assess associations between CS and individual- and county-level factors.

Results: Among 343 people with syphilis during pregnancy, 95 (27.6%) were associated with a case of CS. At the individual level, a history of injection drug use and a history of corrections involvement were associated with an increased risk of CS, whereas a recent gonorrhea diagnosis was associated with a decreased risk of CS. County-level violent crime rate, unemployment, income inequality, and adverse childhood experiences increased the risk of CS. Higher county-level socioenvironmental challenges exacerbated CS risk, particularly among people with corrections involvement.

Conclusions: Injection drug use, corrections involvement, and county-level socioenvironmental challenges increased CS risk among pregnant people with syphilis in Oregon. Urgent interventions are needed, including innovative care models, policy reforms targeting systemic issues, and enhanced collaboration with community services to address the escalating CS crisis.