Project Impact By Country Project Impact By CountryProject Impact By Country
Learn about PSI's models Learn about PSI's modelsLearn about PSI's models

Sterile Injecting Equipment

Provision of sterile injecting equipment is an essential component of combination prevention for HIV among people who use drugs. PSI programs distribute injection equipment, such as needles and syringes, exchange sterile syringes for previously-used syringes, and provide for safe disposal of injection equipment. PSI delivers these programs as part of a broad range of services designed to prevent initiation of injecting drug use, reduce the risk of HIV transmission for those already injecting, and facilitate access to drug treatment and substitution therapy for those ready to reduce or quit their drug use.

Unit of intervention1 needle/syringe

ContentsClean needle, clean syringe (other items may be included such as alcohol swabs, sterile water, cotton filter)

Target populationPeople who inject drugs

For more information about how PSI is increasing access to sterile injection equipment to improve health and save lives, visit our website at:

Model Overview

PSI’s sterile injecting equipment model estimates the number of deaths and DALYs averted per clean needle and/or syringe distributed.

The model is designed with two core components: a baseline scenario in which the PSI sterile injecting equipment intervention is NOT present, and an intervention scenario in which the PSI sterile injecting equipment intervention IS present.

In the intervention scenario, sterile injecting equipment is modeled to have the following impacts:

By comparing the intervention scenario with the baseline scenario, the model is able to estimate how many deaths and DALYs would be averted with a sterile injecting equipment intervention.

Finally, the model estimates the impact of a single clean needle/syringe. This is done by dividing the death and DALY burden that would be averted under the intervention scenario by the number of needles/syringes that would be needed to achieve the coverage level in the intervention scenario. This allows us to move from a hypothetical model of coverage to a model which estimates the impact of a single needle/syringe.

Model Outputs (impact metrics)

Estimates of DALYs averted, deaths averted, CYPs provided, and unintended pregnancies averted represent the projected health impact of the intervention. It is projected because it has not been directly measured.

Example based on distribution of sterile injecting equipment in Myanmar in 2015 Statement of modeled results, examples:

In 2015, an estimated 82 DALYs would be averted if 10,000 clean needles/syringes were distributed in Myanmar.