An Outbreak of Hepatitis C Virus Infections among Outpatients at a Hematology/Oncology Clinic

States have chronic hepatitis C virus (HCV) infection. Health care– associated HCV transmission can occur if aseptic technique is not followed. The authors suspected a health care–associated HCV outbreak after the report of 4 HCV infections among patients at the same hematology/oncology clinic. Objective: To determine the extent and mechanism of HCV transmission among clinic patients