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Purpose: Transgender women experience significant health disparities, including increased risk of HIV infection. In this study, we examined the sexual health needs of transgender women in the context of their overall health and well-being and to identify overarching content framing strategies and content for a mobile health intervention. Methods: We conducted four focus groups and 20 individual in-depth interviews in the United States with racially and geographically diverse transgender women. Results: Four key themes were identified: structural factors as a central part of health; prioritization of transitionrelated care and mental health; the need for sexual health beyond preventing sexually transmitted infections and HIV; and the importance of connection and community. Conclusions: These themes can help inform the development of HIV prevention and sexual health promotion interventions for transgender women. The results suggest that the HIV and sexual health needs of transgender women should be addressed within the context of structural factors with a focus on resilience, community connection, and social support.

Background HIV severely impacts the transgender communities in the United States, and transgender women have the highest HIV incidence rates among any identified risk group. Guided by formative research with transgender women and by an expert advisory panel of transgender women, we designed a prototype mobile app to promote HIV prevention among transgender women. Objective This study aimed to develop and test the usability and acceptability of the prototype Trans Women Connected mobile app. Methods We engaged in a 3-phase prototype development process. After conducting formative research about the health needs of this population, we outlined a theory-based app framework and developed three prototype activities (ie, a vision board, a pre-exposure prophylaxis [PrEP] education activity, and an interactive map). We then tested the usability and acceptability of the mobile app and activities with 16 transgender women using pre- and posttests, think-aloud protocols, and open-ended questions. Results Participants reported high acceptability for the mobile app; the mean rating across all usability and likability questions was 5.9 out of 7. Service utilization intention, goal setting, and social support increased at posttest compared with pretest. Increases in self-efficacy in finding lesbian, gay, bisexual, transgender, and queer–friendly services; intention to seek online social support; and PrEP knowledge were statistically significant. Participants described the app as attractive and useful and perceived all three activities positively. Conclusions This study describes the development and usability and acceptability evaluation of a prototype mobile app designed for and with transgender women for HIV prevention. The usability testing findings provided important insights toward refining and the further development of the Trans Women Connected mobile app. The results suggest that a mobile health intervention can support positive changes. The remaining development and efficacy randomized trial of the Trans Women Connected mobile app is currently underway.