Dr. Tyler Bartholomew Examines the Effects of the IDEA Exchange’s State-Mandated Distribution Model on Injection Risk

The Infectious Disease Elimination Act (IDEA) Exchange, the first legal syringe service program in Florida, operates under a one-for-one syringe distribution model as mandated by state law, where clients can only receive as many new syringes as they return.

A new University of Miami Miller School of Medicine-led study examined the effects of this one-for-one syringe distribution policy on changes in injection risk behaviors overtime at the IDEA Exchange. The study also examined the factors, including syringe coverage, that are associated with injection risk behavior trajectories.

Tyler Bartholomew, who recently defended his dissertation in the Ph.D. in Prevention Science and Community Health program at the Miller School of Medicine’s Department of Public Health Sciences, and a group of collaborative experts found that increasing syringe coverage was associated with a decrease in both sharing injection equipment and reusing syringes. Importantly, the study also found that clients who reported injecting in public were more likely to share syringes over the study period. Patients living with Hepatitis C (HCV), however, did have significant reductions in sharing injection equipment and reusing syringes over time.

“The ultimate goal of our program is to provide clients low barrier access to enough new injection equipment so that they have a new, unused syringe every time they need one,” said study lead author Dr. Bartholomew. “This study continues to add to the existing literature that optimizing syringe coverage is important in reducing risk, and we should remove barriers, like one-for-one exchange policies, to ensure all clients have the ability to remain safe and healthy.” 

“The overwhelming evidence is that needs-based syringe distribution is best practice at syringe services programs," said study senior author Hansel Tookes, M.D., M.P.H., founder of the IDEA Exchange and assistant professor of clinical medicine in the Division of Infectious Diseases at the Miller School. "This study indicates that it is time for our coalition of medical students and community stakeholders to return to the Florida capitol to seek a legislative change for this inferior one-for-one syringe distribution policy."

To conduct the study, co-authors used a prospective observational study design to generate a cohort of 115 syringe services program clients. The clients completed three behavioral assessments during visits to the IDEA Exchange between December 2016 to January 2020, which included collecting sociodemographic and information on injection-related risk behaviors, drug use, and sexual risk. After baseline enrollment, the study collected minimal data at each exchange visit, including the number of syringes disposed of and the number of syringes distributed. In addition, the study asked participants to complete follow-up behavioral assessments, in addition to HIV and HCV testing—on a quarterly basis. The primary outcomes of the analysis were whether any injection equipment, such as syringes, needles, cookers, and cottons, were shared in the previous 30 days and whether needles/syringes were reused, also in the previous 30 days.

Increasing Syringe Coverage Associated with Decrease in Sharing Injection Equipment and Reusing Syringes

The study found that 78.4 percent of the clients from the syringe service program reported reusing syringes at one-year follow-up, suggesting that providing sterile injection equipment in a one-for-one model may not be sufficient to reduce the reuse of syringes. Reuse of syringes can lead to catastrophic bacterial infections like endocarditis, among many other complications. Additionally, those who reported injecting in a public location saw a significant increasing trend in sharing injection equipment—suggesting that additional intervention, such as housing and mobile service delivery, may be needed to reduce injection risk behaviors among this subgroup. Additionally, those who tested HCV-positive showed a 62 percent reduction in sharing injection equipment compared to their HCV-negative counterparts.

When examining sharing injection equipment and reusing syringes, increasing syringe coverage was associated with a 58 percent reduction in sharing injection equipment and a 21 percent reduction in reusing syringes. The median syringe coverage at the last follow-up time point was only 39 percent, which was well below the threshold of sufficient coverage needed to use a new syringe for each injection. Thus, insufficient syringe coverage has been found to be positively associated with syringe reuse. This finding of inadequate coverage among syringe services program participants corroborates previous research from IDEA and expands on the critical role that increasing syringe coverage plays in reducing risk.

Need for State-Level Reform

This study provides preliminary evidence of reductions in injection-related risk behaviors following implementation of a syringe services program and highlights potential high priority groups, such as people experiencing homelessness, that may need additional intervention. In addition, improving syringe coverage among syringe services program clients may be an important factor in reducing behaviors that place individuals at risk for contracting HIV and HCV.

With the expansion of syringe services programs in Florida and in the nation, co-authors note that to further reduce injection-related HIV and HCV risk, policy action must be taken at the state level to reform the state’s restrictive one-for-one exchange to an evidence-based syringe distribution policy.

Written by Amanda Torres
Published on March 24, 2021