Objective: To test the validity of drug users self-reports of diseases associated with drug use, in this case hepatitis A, B, and C.
Design: Injecting drug users (n = 653) were recruited and asked whether they had been diagnosed previously with hepatitis A, B, and/or C. These self-report data were compared to total hepatitis A antibody, hepatitis B core antibody, and hepatitis C antibody seromarkers as a means of determining the validity of the self-reported information.