The Uniject device is a pre-filled one-time use syringe developed by PATH.  A pre-filled, pre-dosed vaccine enables untrained health workers to give life-saving vaccines without wastage, mis-dosing and spread of infection (because the syringe is used only once).  Currently this device is available pre-filled with hepatitis B vaccine or tetanus toxoid. The device is being field-tested for use with other medications, such as gentamicin, which is used to treat life-threatening infections in infants.