1. Rodney C. Perkins 1, Grace K. Douglass 2, Victoria C. Ta 2, Aurnell Dright 1, Michael Fomundam 2, Ying Li 3, Michael Plankey 3 Sexually Transmitted Infection Screening Among HIV-seronegative Men and Women Seeking HIV-testing Only: Missed Opportunity for HIV Prevention? 1 Whitman-Walker Health, Washington, DC, USA; 2 George Washington University School of Public Health, Washington, DC, USA; 3 Georgetown University Medical Center, Washington, DC, USA Results Aims Methods Discussion and Conclusions 1.To determine the feasibility of implementing a STI self-testing option in a clinical setting 2.To estimate the prevalence of STIs among HIV-seronegative, asymptomatic men and women seeking HIV testing only Self-collected urine, throat and/or rectal swabs for Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (GC) and a blood draw for Syphilis, with no physical examination, were collected from 940 HIV- seronegative, asymptomatic adults at a walk-in clinic in Washington, DC. Sociodemographic and sexual risk behavior data were collected (Table 1), and a post-testing satisfaction survey was completed by each client. Descriptive statistics of demographics, condom use, and self test results for STIs were generated by client’s gender (Table 2). Type of sexual partnerships by results of STI testing were tabulated (Table 3). Univariate associations of responses to survey questions with client’s gender were examined using Fisher’s exact test. The risk factors of STIs were investigated using univariate and multivariate generalized linear models with repeated measures. The iterative fitting algorithm was performed for repeated measures in modeling to avoid the violation of the assumption of independence due to the multiple measures of the same clients. The full multivariate model consisted of age, race/ethnicity, condom use, and type of sexual partnership. Statistical significance was evaluated at the 0.05 level. Prevalence ratios of STIs with 95% confidence intervals (CI) were calculated for each model. All analyses were performed using SAS version 9.3 (SAS Institute Inc., Cary, NC, USA). Variable Client’s gender, n (%) Male (N = 744) Female (N = 196) Total, n (%) (N = 940) Age Median (IQR)31 (26, 39)28 (24, 35)30 (25, 39) Race/Ethnicity African-American262 (35.2)140 (71.4)402 (42.8) White297 (39.9)32 (16.4)329 (35.0) Hispanic121 (16.3)11 (5.6)132 (14.0) Other64 (8.6)13 (6.6)77 (8.2) Condom use All of the time154 (20.7)29 (14.8)183 (19.5) Most of the time351 (47.2)60 (30.6)411 (43.7) Some of the time164 (22.0)65 (33.2)229 (24.4) Never75 (10.1)42 (21.4)117 (12.4) Background Sexually transmitted infections (STIs) increase the risk of HIV infection; however concurrent HIV and STI testing may not be available in all clinical settings. In previous work, we showed a high concordance of self vs. provider administered swab testing for Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (GC). Self-administered STI testing kits were offered to clients seeking HIV testing only but potentially at risk for other STIs during Community Health Outreach Program’s walk-in HIV testing hours at Whitman Walker Health in Washington, DC. In this study, we evaluated the implementation of STI self-testing among HIV-seronegative, asymptomatic adults. Sexual Partnership Total, n (%) (N = 940) any STI, n (%) (N = 940) Chlamydia, n (%) (N = 934) Gonorrhea, n (%) (N = 934) Syphilis, n (%) (N = 928) PositiveNegativePositiveNegativePositiveNegativePositiveNegative MSM460 (48.9)100 (10.6)360 (38.3)61 (6.5)398 (42.6)46 (4.9)413 (44.2)13 (1.4)442 (47.6) MSW218 (23.2)23 (2.5)195 (20.8)18 (1.9)196 (21.0)6 (0.6)208 (22.3)5 (0.5)211 (22.8) MSM/W66 (7.0)12 (1.3)54 (5.7)7 (0.8)58 (6.2)7 (0.8)58 (6.2)1 (0.1)64 (6.9) WSM162 (17.2)17 (1.8)145 (15.4)17 (1.8)145 (15.5)4 (0.4)158 (16.9)0158 (17.0) WSW11 (1.2)0 0 0 0 WSM/W23 (2.5)1 (0.1)22 (2.3)1 (0.1)22 (2.4)023 (2.5)0 MSM = men who have sex with men, MSW = men who have sex with women, MSM/W = men who have sex with men and women, WSM = women who have sex with men, WSW = women who have sex with women, WSM/W = women who have sex with men and women. Table 3: STI status by type of sexual partnership Client’s gender, n (%) Total, n (%) (N = 940) Male (N = 744)Female (N = 196) Self-testPositiveNegativePositiveNegativePositiveNegative Any STI135 (18.2)609 (81.8)18 (9.2)178 (90.8)153 (16.3)787 (83.7) Any Chlamydia86 (11.6)652 (87.6)18 (9.2)178 (90.8)104 (11.1)830 (88.3) Pharyngeal 15 (2.0) 603 (81.1) 6 (3.1) 166 (84.7) 21 (2.2) 769 (81.8) Rectal 50 (6.7) 442 (59.4) 11 (5.6) 71 (36.2) 61 (6.5) 513 (54.6) Urine 32 (4.3) 694 (93.3) 13 (6.6) 180 (91.9) 45 (4.8) 874 (93.0) Any Gonorrhea59 (7.9)679 (91.3)4 (2.0)192 (98.0)63 (6.7)871 (92.7) Pharyngeal 43 (5.8) 575 (77.3) 2 (1.0) 170 (86.7) 45 (4.8) 745 (79.2) Rectal 26 (3.5) 466 (62.6) 3 (1.5) 79 (40.3) 29 (3.1) 545 (58.0) Urine 11 (1.5) 715 (96.1) 1 (0.5) 192 (98.0) 12 (1.3)907 (96.5) Syphilis19 (2.6)717 (96.4)0192 (98.0)19 (2.0)909 (96.7) Table 1: Demographics and condom use of 940 client visits by client’s gender Table 2: Self test results by client’s gender In the multivariate model, the prevalence ratio for age in 5-year increments was 0.87 (p = 0.004, 95% CI: 0.79  0.95) among those with any STI. Among any positive CT, those who reported condom use some of the time had a ratio of 1.85 (p = 0.04, 95% CI: 1.02  3.38) compared to those who reported using condoms all the time. When compared to WSM, MSM had a prevalence ratio of 2.41 (p = 0.001, 95% CI: 1.42  4.08) for any positive STI results and 3.87 (p = 0.017, 95% CI: 1.27  11.78) for positive GC result. MSM/W had a ratio of 4.49 (p = 0.02, 95% CI: 1.27  15.87) among those with a positive GC result (data not shown). 96.2% of clients reported high acceptance of self-testing with 97.7% reporting they would repeat testing, and 97.4% likely to recommend it (data not shown). The implementation of a self-test option for STI testing in a structured clinical setting was highly successful. There was a high prevalence (16.3%) of asymptomatic STI positivity among HIV-seronegative men and women seeking HIV testing only in Washington, DC. “Know Your Status” and “Test and Treat” strategies have raised awareness for testing and decreased late HIV disease presentation. Novel and innovative approaches to concurrent HIV and STI testing targeting MSM and MSM/W including emerging adults can reduce the risk of HIV acquisition by raising awareness of asymptomatic and extra genital STI presentation. The potential of using self-administered testing in non-traditional settings such as community-based organizations, sex venues or other non-clinical settings is possible. Among the 940 HIV-seronegative clients, the median age was 30 years and 79.1% were men. Most of the women were African-American (71.4%) while a majority of the men were White (39.9%). About 43.7% of clients reported condom use most of the time (Table 1). Men who have sex with men (MSM) accounted for 48.9% of the study sample (Table 3). The overall prevalence of any STI was 16.3% with 11.1% for CT and 6.7% for GC. In general, the prevalence of STI by anatomic site was higher among men compared to women: rectal CT (6.7% vs 5.6%), rectal GC (3.5% vs 1.5%), pharyngeal CT (2.0% vs. 3.1%), pharyngeal GC (5.8% vs 1.0%); and syphilis (2.6% vs. 0%) (Table 2). Among all types of sexual partnership, MSM had the highest prevalence of any STI (10.6%) and lowest (0%) for WSW (Table 3).