Transvestites and young transsexual women in Brazil are exposed to a high risk of exposure to HIV and poor treatment of HIV infection. Brazil remains classified as a middle-income country in 2017 \[1\], despite the difficult political and economic climate. In 2016, there were 830,000 adults and children living with the HIV virus \[2\], with a 2% increase in new infections \[2\]. The first population-based study to assess HIV prevalence and knowledge of pre-exposure prophylaxis (PrEP) with young trans womenin Rio de Janeiro, Brazil (Transcender Study) found that 31.2% of them were infected with HIV. In this study, among young women aged 18 to 24 years, 24.2% of them were infected with HIV, a higher rate than any other study in young trans womenin the world \[3, 4\], and young women had three times as many unrecognized infections as adults \[5\]. These findings are worse than previous research suggests, that one in five transvestites or young transsexual women under the age of 25 was infected with the HIV virus \[6, 7\]. Even more worrisome, the young trans women in our study had had almost twice as much unprotected anal. Adverse events assessment and reporting sex in the past three months, while their perception of HIV risk was less than half. The data reflect that there is no decline in incident infections among young women and point to a need for early intervention to reduce the risk among transvestites and young transsexual women. This is a study in collaboration with the San Francisco Department of Public Health (SFDPH). All stages will be carried out in Brazil, at the National Institute of Infectious Diseases Evandro Chagas (INI)-FIOCRUZ. People (health professionals and trans people) will be referred from four services in Rio de Janeiro, Brazil, namely: INI-FIOCRUZ, Zilda Arns Family Clinic, Luiz Capriglione Diabetes and Endocrinology Institute (IEDE) and Heitor Municipal Health Center Beltron.

The study includes the collection of formative data, the evaluation of an anti-stigma campaign and an intervention study (pilot + scale-up) of HIV prevention and treatment. The expansion provides for a Type 1 hybrid design to assess the results of the exploratory implementation and examine the results of the single-arm intervention including 150 young transvestites and trans women. We will use a pre-post design to assess intervention outcomes and include an external comparison group using data extracted from the Ministry of Health to determine the effect of our intervention on engagement and adherence to PrEP and attachment to HIV care. Implementation results will also be explored with stakeholders at partner clinics, participants and key staff. In summary, formative data will be collected with 10 young young trans women to adapt a digital systems navigation and HIV prevention and care intervention to the cultural context and HIV prevention and care needs of this population group in Brazil. A highly visible and community-informed social marketing campaign will be developed and implemented to reduce anti-trans stigma at four SUS clinics in Rio de Janeiro. To measure success, pre- and post-campaign implementation interviews will be conducted with healthcare providers at the four clinics. Additionally, a pilot, phase I study will be conducted with 20 young participants to determine the preliminary effectiveness of the antistigma campaign and navigation systems intervention and demonstrate our ability to recruit young people in this population. Exit interviews will be conducted with all pilot participants (N = 20) to collect data to refine the intervention. Finally, an expansion of the pilot intervention study will be carried out, with the inclusion of another 150 participants. At this stage, all participants will receive the BeT intervention for a period of three months, in addition to standard care for HIV prevention and care. The study includes a Type 1 hybrid design study will be conducted to assess the results of the exploratory implementation and examine the results of the single-arm intervention including 150 transvestites and young trans women. We will use a pre-post design to assess intervention outcomes and include an external comparison group using data extracted from the Ministry of Health to determine the effect of our intervention on engagement and adherence to PrEP and attachment to HIV care. n total, the participants submitted to the intervention will stay in the project for one year. The initial visit will take approximately 2 hours to develop a case management plan with a team member (ARTAS plan). As part of the intervention, volunteers will be asked to participate in a baseline behavioral survey, followed by four others over one year (ie at 3, 6, 9, and 12 months). These surveys will last approximately 1 hour. During the intervention period, the volunteers will have contact with the digital browsers at least five times via WhatsApp or other social media to check the progress of the ARTAS plan and possibly more times depending on the participant's needs.

Each interaction should not last longer than an hour. In total, participants must spend 17 hours participating in the intervention, with no maximum time to adapt to the participant's needs. Recruitment for the study will feature the FIOCRUZ team of educators, composed of three members of the trans community, in addition to the possibility of peer recruitment. Both the confirmation of eligibility and the randomization process will be carried out with double verification. The inclusion visit will be carried out in person. After the consent and eligibility verification process, participants will be included in the study and will answer questionnaires administered by trained interviewers. The Shine and Transcender (BeT) intervention was based on ARTAS, an evidencebased, individual-level, multiple-session, time-limited intervention for system navigation and linkage for HIV treatment \[29\]. It lasts for 3 months and is composed of BeT sessions, digital interactions, asynchronous and automatic messages. Interim analysis of primary outcomes will be performed as described in Section 9.4.6, Planned Interim Analyzes. Analyzes considering HIV serological status (HIV-positive or -negative) will be performed in accordance with Section 9.4.7, Subgroup Analysis. With this study, it is expected to evaluate the modification associated with the BeT intervention in prevention (engagement and adherence to PrEP) and in HIV treatment (attachment to care). Clinical trials are a powerful tool for the evaluation of health interventions, whether drug or not. Through this study, it will be possible to assess the effectiveness of a digital intervention based on peer browsing in HIV prevention and care. As this is a study with only one arm, this can interfere with obtaining measurements or verifying outcomes. To minimize the possibility of bias, the assessment of outcomes will be performed by people other than those administering the intervention. In addition, we will benchmark against an outside group, with information from the Ministry of Health's national registry systems, to determine the effect of our intervention on engagement and adherence to PrEP and linkage to HIV care.