LAUSR

Sexual minority cisgender people and transgender people commonly reported having transgender sex partners. This study observed significant heterogeneity in HIV/sexually transmitted infection (STI) prevalence and preventative behaviors among the partners of transgender people. Background Transgender and nonbinary (TNB) people are diverse in their sexual orientation and partnerships. We describe the epidemiology of HIV/sexually transmitted infection (STI) prevalence and prevention utilization among the partners of TNB people in Washington State. Methods We pooled data from five 2017 to 2021 cross-sectional HIV surveillance data sources to generate a large sample of TNB people and cisgender people who had a TNB partner in the past year. We described characteristics of recent partners of trans women, trans men, and nonbinary people and used Poisson regression to assess if having a TNB partner was associated with self-reported HIV/STIs prevalence, testing, and preexposure prophylaxis (PrEP) use. Results Our analysis included 360 trans women, 316 trans men, 963 nonbinary people, 2896 cis women, and 7540 cis men. Overall, 9% of sexual minority cis men, 13% of sexual minority cis women, and 36% of TNB participants reported having any TNB partners. There was significant heterogeneity in HIV/STI prevalence, testing, and PrEP use among the partners of TNB people by study participant gender and the gender of their sex partners. In regression models, having a TNB partner was associated with a higher likelihood of HIV/STI testing and PrEP use but was not associated with higher HIV prevalence. Conclusions We observed significant heterogeneity in HIV/STI prevalence and preventative behaviors among the partners of TNB people. Given that TNB people are diverse in their sexual partnerships, there is a need to better understand individual-, dyad-, and structural-level factors that facilitate HIV/STI prevention across these diverse partnerships.