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1 | INTRODUCTION South Africa has the highest burden of HIV in the world with a national prevalence of 18.9% [1-3]. Adolescent girls and young women account for 29% of [...], Introduction: Young women in Southern Africa have extremely high HIV incidence rates necessitating the availability of female-controlled prevention methods. Understanding adolescent preference for seeking contraception would improve our understanding of acceptability feasibility and adherence to similar modes of delivery for HIV prevention. Methods: UChoose was an open-label randomized crossover study over 32 weeks which aimed to evaluate the acceptability and preference for contraceptive options in healthy HIV-uninfected, female adolescents aged 15 to 19 years, as a proxy for similar HIV prevention methods. Participants were assigned to a contraceptive method for a period of 16 weeks in the form of a bi-monthly injectable contraceptive, monthly vaginal Nuvaring[R] or daily combined oral contraceptive (COC) and then asked to state their preference. At 16 weeks, participants crossed over to another contraceptive method, to ensure that all participants tried the Nuvaring[R] (least familiar modality) and additionally either the injection or COC. Primary outcomes were contraceptive acceptability and preference. At the end of the 32 weeks they were also asked to imagine their preference for an HIV prevention modality. Secondary endpoints included changes in sexual behaviour, contraceptive adherence and preference for biomedical and behavioural HIV prevention methods. Results: Of the 180 participants screened, 130 were enrolled and randomized to the Nuvaring[R] (n = 45), injection (n = 45) or COC (n = 40). Significantly more Nuvaring[R] users (24/116; 20.7%) requested to change to another contraceptive option compared to injection (1/73; 1.4% p = 0.0002) and COC users (4/49; 8% p = 0.074). Of those that remained on the Nuvaring[R], adherence was significantly higher than to COC (p < 0.0001). Significantly more injection users (77/80; 96.3%) thought this delivery mode was convenient to use compared to Nuvaring[R] (74/89; 83.1%; p = 0.0409) or COC (38/50; 76.0%; p = 0.0034). Overall, the preferred contraceptive choice was injection, followed by the ring and lastly the pill. Conclusions: Adherence to daily COC was difficult for adolescents in this cohort and the least favoured potential HIV prevention option. While some preferred vaginal ring use, these data suggest that long-acting injectables would be the preferred prevention method for adolescent girls and young women. This study highlights the need for additional options for HIV prevention in youth. Keywords: HIV prevention; youth; South Africa; preference; adolescent girls; adherence

Adherence to daily oral pre-exposure prophylaxis (PrEP) for HIV prevention has been challenging for adolescent girls and young women (AGYW). As part of The Community PrEP Study (CPS), AGYW were randomised to HIV-prevention empowerment counselling (intervention) or basic medication pick-up (control). In this qualitative sub-study, we interviewed AGYW participants (n = 39) to explore PrEP use and study experiences by study arm, and study staff (n = 7) to explore study implementation, site environment, and participant engagement. Data were thematically analysed using a constant comparison approach. Comparative matrices assessed similarities and differences in study experiences and PrEP support preferences. Friendly, non-judgmental, non-stigmatizing study staff were described as central to participant's positive experiences. Participants highly valued CPS staff's holistic health support (e.g. physical and psycho-social). Intervention participants described empowerment counselling as helpful in supporting PrEP disclosure. However, control participants also described disclosing PrEP use to trusted individuals. Participants and staff recommended public-sector PrEP services provide holistic, confidential, and integrated sexual and reproductive health services, and community sensitisation. An adolescent and youth-friendly environment was the primary factor motivating AGYW's study engagement. While HIV-prevention empowerment counselling was well received, welcoming, respectful and non-judgmental staff may be the 'secret sauce' for implementing effective PrEP services to AGYW. [ABSTRACT FROM AUTHOR]