Reuse of syringes is one of the major problems facing preventive and curative healthcare in the world. Many countries have syringe reuse rates of 50% and more. Whether unintentional due to poor understanding of risks, or intentional due to greed or supply shortages, the practice of reusing syringes causes significant transmission of diseases such as HIV, Hepatitis B, and Hepatitis C. People being treated for one disease may be inadvertently given another, more harmful disease.