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Background Sexually transmitted disease (STD) rates continue to rise in the United States (US). Over half of all new STDs occur in adolescents and young adults (AYA). Few studies have evaluated how sexual behaviors such as number of partners or condom use may contribute to this increase. We aimed to determine the association of sexual behaviors and condom use with STD incidence over time among AYA. Methods We reviewed all AYA ages 13–26 years attending a public STD clinic in Rhode Island from 2013–2017. We reviewed demographic and behavioral data including age, gender identity, risk group, race, ethnicity, insurance status, sexual behaviors, substance use, self-reported STD/HIV diagnosis (lifetime, past year), condom use, and HIV/STD testing results. We report proportions in 2013 and 2017, and performed trend analyses (Cocharn-Armitage test for categorical variables and Kruskal–Wallis trend test for continuous variables) to determine trends over time. Results A total of 3,822 AYA visited the clinic during the study time period. An increasing trend was observed for: multiple (≥5) partners (29% of AYA in 2013 vs. 38% in 2017, P < 0.001), self-reported past year and lifetime STD diagnosis (12 vs. 21%, P < 0.001 and 19 vs. 33%, P < 0.001, respectively), and lab-documented diagnosis of any STD (15 vs. 25%, P < 0.001), syphilis (2 vs. 5%, P = 0.006), any chlamydia (11 vs. 20%, P = 0.001), and any gonorrhea (3 vs. 8%, P = 0.008). A decreasing trend was observed for: white race (66% in 2013 vs. 43% in 2017, P < 0.001), uninsured (73 vs. 53%, P < 0.001), condomless sex during oral as well as vaginal/anal sex (22 vs. 10%, P = 0.001 and 16 vs. 8%, P = 0.001, respectively), and self-reported HIV diagnosis (2.5% to 0.9%, P = 0.016). Conclusion Among AYA, risk behaviors such as condomless sex and multiple partners increased significantly from 2013–2017, which may be contributing to an increase in STDs. Increased public health efforts are needed to promote education and other interventions to address behaviors associated with STD transmission. Disclosures All authors: No reported disclosures.

open forum infectious diseases

425. Longitudinal Trends in Risk Behaviors and Sexually Transmitted Diseases among Adolescents and Young Adults at a Sexually Transmitted Diseases Clinic, 2013–2017