Rollover Protocol Continued Access to Tenofovir Disoproxil Fumarate (TDF) for Subjects in Taiwan

Inclusion Criteria: Subjects must meet all of the following inclusion criteria to be eligible for participation in this study. * Complete all end of study visit procedures for the GS US 174-0108 study. * Willing and able to provide written informed consent. * A negative pregnancy test is required for female subjects at the end of study visit (i.e., screening visit for study GS-US-174-0141) for GS US 174-0108 (unless surgically sterile or greater than two years post-menopausal) * All sexually active female subjects who are not post menopausal, or surgically sterile and are of childbearing potential must agree to use a highly effective method of contraception during heterosexual intercourse throughout the study. * Male subjects who are sexually active are required to use barrier contraception (condom with spermicide) during heterosexual intercourse through to study completion. Exclusion Criteria: • Not Applicable