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Low saliva pH can yield false positives results in simple RT-LAMP-based SARS-CoV-2 diagnostic tests
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Low saliva pH can yield false positives results in simple RT-LAMP-based SARS-CoV-2 diagnostic tests
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Journal Article
Low saliva pH can yield false positives results in simple RT-LAMP-based SARS-CoV-2 diagnostic tests
2021
Overview
Diagnosis of any infectious disease is vital for opportune treatment and to prevent dissemination. RT-qPCR tests for detection of SARS-CoV-2, the causative agent for COVID-19, are ideal in a hospital environment. However, mass testing requires cheaper and simpler tests, especially in settings that lack sophisticated machinery. The most common current diagnostic method is based on nasopharyngeal sample collection, RNA extraction, and RT-qPCR for amplification and detection of viral nucleic acids. Here, we show that samples obtained from nasopharyngeal swabs in VTM and in saliva can be used with or without RNA purification in an isothermal loop-mediated amplification (LAMP)-based assay, with 60–93% sensitivity for SARS-CoV-2 detection as compared to standard RT-qPCR tests. A series of simple modifications to standard RT-LAMP published methods to stabilize pH fluctuations due to salivary acidity resulted in a significant improvement in reliability, opening new avenues for efficient, low-cost testing of COVID-19 infection.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Antigens
/ Cancer
/ COVID-19
/ Editing
/ Funding
/ Humans
/ Medicine and health sciences
/ Methods
/ Molecular Diagnostic Techniques - methods
/ Nucleic Acid Amplification Techniques - methods
/ Patients
/ Proteins
/ Research and analysis methods
/ Saliva
/ SARS-CoV-2 - isolation & purification
/ Severe acute respiratory syndrome coronavirus 2
/ Tubes
/ Viruses
