Rollover Protocol Continued Access to Emtricitabine/Tenofovir Disoproxil Fumarate for Subjects in United States

Inclusion Criteria:

- Complete all end of study visit procedures and PK substudy (if applicable) for the GS
US 203 0107 study.

- A negative pregnancy test is required for female subjects at the end of study visit
for GS US 203 0107 (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.