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. 2021 Jun 29;11:653616. doi: 10.3389/fcimb.2021.653616

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Copyright © 2021 Juscamayta-López, Valdivia, Horna, Tarazona, Linares, Rojas and Huaringa

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Evaluation of the single LAMP primer sets based on target dilution. Reactions using primer sets R18 (A), 8N3 (B), R2 (C), and R34 (D) were considered positive for RT-LAMP products if they had both a color change from brown to green and a laddered banding pattern on agarose gel after electrophoresis. Target dilution was based on log10 dilutions (10^-1 to 10^-7) of SARS-CoV-2 RNA obtained from clinical samples and the samples were analyzed in parallel by simplex RT-LAMP (A–D) and RT-qPCR (E) assays. CT₀, initial cycle threshold value of the clinical samples obtained by RT-qPCR; C₀, initial concentration of the clinical samples; NTC, negative non-template control; bp, base pair.