Therefore, a phase I/II, open-label, prospective, single arm, pharmacokinetic clinical trial in 100 HIV negative subjects (50% of whom will have to be of self-identified African ancestry and 50% females, approximately) is to be conducted. The study will examine whether a monthly dose of TMC278LA not exceeding 600 mg i/m over a time period of approximately six months, with a loading regimen of the first two i/m injections separated by two weeks, is safe and well tolerated by HIV-negative subjects.