Absolute Quantitation of Viremia in Human Immunodeficiency Virus Infection by Competitive Reverse Transcription and

A competitive polymerase chain reaction (PCR)-based assay for the quantitative detection of human immunodeficiency virus type 1 (HIV-1) viremia was developed and optimized. This method consists of the reverse transcription and subsequent amplification in the same tube of two similar RNA templates, the wild-type template to be quantified and a known amount of the internally deleted synthetic template, both with identical primer recognition sites. The same strategy also proved to be useful in the quantitative assay of HIV-1-specific cellular transcripts and proviral DNA sequences from peripheral blood mononuclear cells by using competitor DNA. The method might be of interest in the study of the precise level of HIV-1 activity during the different clinical phases of the infection and in the simple, fast, and methodologically correct molecular investigation of patients treated with specific antiviral compounds. Similar to other lentivirus infections (16), the time course of human immunodeficiency virus type 1 (HIV-1) infection is slow (10), and it is commonly believed that the initial viremia present in patients with primary HIV-1 infection is followed by antibody production and a decrease in virus replication in target cells (1, 2, 9, 11, 14, 18). Subsequently, depletion o