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There is a clear need for an instrument-free molecular diagnostic system for detecting human immunodeficiency virus type 1 (HIV-1) RNA or DNA that can be used in developing countries. Such a test could be used for early diagnosis of HIV-1 infection during infancy and could serve as a surrogate end point for vaccine trials. We developed the IsoAmp HIV-1 assay (BioHelix Corporation), which targets the HIV-1 gag gene with use of isothermal reverse-transcription helicase-dependent amplification chemistry. The IsoAmp HIV assay uses a disposable amplicon containment device with an embedded vertical-flow DNA detection strip to detect the presence of HIV-1 amplicons. The vertical-flow DNA detection strip has a control line to validate the performance of the device and a test line to detect the analyte. The analyte is detected by a sandwich immunoassay for reporter moieties on a capture probe and a detection probe. The control line consists of the detection probe reporter moiety conjugated to the vertical-flow DNA detection strip. The preliminary limit of detection of the IsoAmp HIV assay was evaluated by testing serial dilutions of HIV-1 armored RNA (Assuragen). We found that 21 (75%) of 28 assays yielded positive results when 50 copies of HIV-1 armored RNA were input into the IsoAmp HIV reaction.

Nucleic Acid Assay System for Tier II Laboratories and Moderately Complex Clinics to Detect HIV in Low‐Resource Settings