Medicaid Expansion and Rates of Reportable Sexually Transmitted Infections in the United States: A County-Level Analysis.

Chlamydia, gonorrhea, and primary/secondary syphilis rates in 2018 were significantly higher in counties located in states without Medicaid expansion compared with those with Medicaid expansion. For sexually transmitted infections combined, 59.9% of counties without Medicaid expansion were in the highest 2 sexually transmitted infection rate quartiles compared with 42.2% of counties with Medicaid expansion (P < 0.0001).