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Upon entry into a host cell, the HIV-1 virus undergoes a series of critical early replication events including reverse transcription, nuclear import, and integration of its cDNA into the host genome. Molecular assays used to detect and analyze changes in HIV-1 early phase replication events are valuable tools in developing potential antiretroviral drugs, as well as studying the pathogenesis of HIV. Described here are the molecular assays utilized to detect and quantify HIV-1 early, intermediate, and late reverse transcription (RT) products. In addition to this, protocols for quantifying HIV-1 2-LTR circle DNA and proviral DNA after integration are also included. In these protocols, the optimized TaqMan Real-time PCR reagent is used to increase assay sensitivity and reproducibility. Furthermore, a nested PCR is applied to HIV-1 integration quantification with increased accuracy.