The objective is to obtain plasma samples from Human Immunodeficiency Virus Type 1 (HIV-1) infected individuals that have viral loads across the dynamic range of the Aptima HIV-1 assay. The plasma samples will be tested in a method comparison study to support the approval of the Aptima HIV-1 assay on Gen-Probe's Panther testing system. The objective of the method comparison study is to evaluate the clinical utility of the Aptima HIV-1 assay by comparing the results to the FDA-licensed COBAS assay (Roche Molecular Systems, Inc., Branchburg, New Jersey) in plasma samples that have viral loads across the dynamic range of the Aptima HIV-1 assay.