@article {LiuA83, author = {Gui Liu and Cara Broshkevitch and David Katz and Rachel Silverman and Matthew Golden and Ruanne Barnabas}, title = {O19.3 Partner services for gonorrhea can decrease new HIV among MSM in king county, washington: a mathematical modeling study}, volume = {95}, number = {Suppl 1}, pages = {A83--A83}, year = {2019}, doi = {10.1136/sextrans-2019-sti.212}, publisher = {The Medical Society for the Study of Venereal Disease}, abstract = {Background Partner services (PS) for bacterial STIs has potential to increase STI treatment among infected sex partners and HIV testing among people diagnosed with STIs and their partners. The population-level impact of PS on gonorrhea and HIV incidence has not been estimated.Methods Calibrated to King County{\textquoteright}s MSM population, our compartmental gonorrhea-HIV coinfection model captures sexual mixing, gonorrhea and HIV transmission, and scale-up of antiretroviral therapy (ART), pre-exposure prophylaxis (PrEP), and routine STI screening. We assessed incremental impact of PS over 5 and 20 years, and compared gonorrhea and HIV incidence and prevalence without PS, with PS, and with PS that integrates promotion of HIV testing (PS+HIV). In the absence of PS, we assumed that 10\%, 10\%, and 95\% of rectal, pharyngeal, and urethral gonorrhea were treated and 63\% of MSM receiving gonorrhea treatment also received HIV testing. With PS, 40\% of treated cases received PS, increasing the proportion of partners treated for gonorrhea and tested for HIV by 4\%, 4\%, and 38\% at each site. PS+HIV increased the proportion of gonorrhea-infected MSM tested for HIV to 83\%.Results After 5 and 20 years, PS modestly changed rectal, pharyngeal, and urethral gonorrhea incidence and prevalence (\<7\%). After 5 years, HIV prevalence decreased 0.1\% with PS and 0.5\% with PS+HIV. HIV incidence decreased 6.0\% (from 187.1 to 176.0 per 100,000 persons) with PS and 14.7\% (187.1 to 159.6/100,000) with PS+HIV. After 20 years, HIV prevalence decreased 3.2\% with PS and 5.6\% with PS+HIV. PS reduced incidence 23.3\% (75.2 to 57.7/100,000) and PS+HIV 37.7\% (75.2 to 46.9/100,000).Conclusion Moderate gonorrhea PS coverage had modest impact on gonorrhea, given high rates of STI testing and treatment in King County. However, long-term PS+HIV increased HIV testing opportunities and substantially reduced HIV incidence. PS+HIV is a potential approach for prioritizing HIV testing in high ART and PrEP coverage settings.Disclosure No significant relationships.}, issn = {1368-4973}, URL = {https://sti.bmj.com/content/95/Suppl_1/A83.1}, eprint = {https://sti.bmj.com/content/95/Suppl_1/A83.1.full.pdf}, journal = {Sexually Transmitted Infections} }