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Background In 2018, Philadelphia County ranked 7th, 8th and 16th for chlamydia (CT), gonorrhea (GC), and syphilis cases, respectively, in the Centers for Disease Control (CDC) STI Surveillance Report. Asymptomatic presentations and lack of routine screening, especially at extragenital (i.e., pharyngeal and rectal) sites, increase the challenge of timely diagnosis and treatment. We determined extent of screening, reported symptoms, and asymptomatic infections. Methods We analyzed records of 372 patients receiving care at an urban, university-based Ryan White HIV clinic from 2016-2018. Outcomes included: positive GC/CT nucleic acid amplification tests from genital, pharyngeal, and rectal sites as well as new diagnoses of syphilis. We collected demographic data, risk factors for HIV transmission, time from HIV diagnosis, number of clinic visits, multiple sex partners, partner with STI, and injection drug use. We used logistic regression to model factors associated with STIs and determined prevalence of asymptomatic STIs. Results Of 372 participants, 234 (63%) were men, 262 (70%) were Black, 245 (66%) were over 40 years old, 148 (40%) identified as MSM, 140 (38%) reported inconsistent condom use, 89 (24%) reported multiple sex partners, 35 (9%) reported injection drug use, 141 (38%) had past STI, and 26 (7%) had partner with past STI. Mean time from HIV diagnosis was 12.3 years (SD, 8.8) and mean number of clinic visits was 2/year. Testing included 720 GC/CT urine, 176 GC/CT pharyngeal, 143 GC/CT rectal swabs and 887 syphilis blood tests. Asymptomatic GC/CT infections were seen in urine 6/22 (27%), pharyngeal 12/14 (86%) and rectal 28/31 (90%) swabs. And, of 39 new diagnoses of syphilis, 23 (59%) were asymptomatic. In multivariate analysis, men (aOR, 12.2, 95%CI, 2.7-55.3), &amp;lt; 40 years (3.2, 1.7-6.1), with clinic visit in 2018 (1.4, 1.2-1.8), and partner with STI (1.7, 0.9-2.8) were more likely to have a positive GC/CT test. Patients with positive syphilis test were more likely men (4.6, 1.1-20.2), with multiple sex partners (3.7, 1.7-8.0), and more recent HIV diagnosis (1.1, 1.0-1.1). Prevalence of Asymptomatic STIs Conclusion Results indicate the importance of routine, site-specific STI screening among patients living with HIV. Our findings can inform screening strategies among urban HIV populations. Disclosures All Authors: No reported disclosures

1541. Prevalence of Asymptomatic Sexually Transmitted Infections (STIs) in a Philadelphia Ryan White HIV population