['hepatitis c virus infection']
['sof/vel', 'rbv']

        Key Inclusion Criteria:

          -  Willing and able to provide written informed consent

          -  HCV genotype determined by the Central Laboratory

          -  HCV RNA > LLOQ at screening

          -  Participated and completed a Gilead sponsored HCV treatment study of direct acting
             antiviral (DAA) containing regimens.

          -  Male and female of childbearing potential must agree to use protocol specified
             method(s) of contraception

        Key Exclusion Criteria:

          -  Current or prior history: Clinically-significant illness (other than HCV) or any other
             major medical disorder that may interfere with treatment, assessment or compliance
             with the protocol; individuals currently under evaluation for a potentially
             clinically-significant illness (other than HCV) are also excluded.

          -  Screening ECG with clinically significant abnormalities

          -  Laboratory results outside of acceptable ranges at screening

          -  Infection with hepatitis B virus (HBV) or human immunodeficiency virus (HIV)

        NOTE: Other protocol defined Inclusion/ Exclusion criteria may apply.
      