The goal of this clinical trial is to assess the effectiveness of an evidence-based, organizational-level implementation strategy, the Systems Analysis and Improvement Approach, in improving HIV service delivery (SAIA-SSP-HIV) in U.S. syringe services programs (SSPs). The main questions it aims to answer are: * Does SAIA-SSP-HIV improve delivery of HIV services (including the proportion of SSP participants receiving HIV testing and referrals to appropriate clinical services for HIV prevention and treatment) compared to implementation as usual (IAU)? * Does SAIA-SSP-HIV result in sustained improvement of HIV service delivery cascades (including the proportion of SSP participants receiving HIV testing and referrals to appropriate clinical services for HIV prevention and treatment) compared to IAU? * What are the costs associated with SAIA-SSP-HIV and how cost-effective is the strategy? The trial will take place over 21 months and consist of a 3-month lead-in period, a 12-month active period, and a 6-month sustainment period. During the 12-month active period a SAIA specialist will meet with SSPs randomized to the SAIA-SSP-HIV arm to help them optimize their HIV service delivery cascades. Researchers will compare the SAIA-SSP-HIV and IAU arms to see if HIV service delivery and costs and cost-effectiveness differ by group.
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Effectiveness
Timeframe: 12 months
Sustained Effectiveness
Timeframe: 18 months
Costing
Timeframe: 18 months