Evidence map›Paper›PMID 34385527›Full record

ArticleScientific reports2021

A molecular test based on RT-LAMP for rapid, sensitive and inexpensive colorimetric detection of SARS-CoV-2 in clinical samples.

Catarina Amaral, Wilson Antunes, Elin Moe, Américo G Duarte, Luís M P Lima, Cristiana Santos, Inês L Gomes, Gonçalo S Afonso, Ricardo Vieira, Helena Sofia S Teles and 7 more

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 80 papers.

0numbers the graph read from it
0cells of the map it votes in
80citing papers in PubMed
10.6field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

80 citing papers in PubMed, 153 citations in OpenAlex.

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  6. Standardization and performance of SARS-CoV-2 RT-LAMP detection: a reliable, inexpensive, and alternative diagnostic assay.Brazilian journal of microbiology : [publication of the Brazilian Society for Microbiology] · 2025
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20 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

17 authors at 6 institutions in 1 country.

Catarina AmaralInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal.
Wilson AntunesCentro de Investigação da Academia Militar (CINAMIL), Unidade Militar Laboratorial de Defesa Biológica e Química (UMLDBQ), Av. Dr. Alfredo Bensaúde, 1849-012, Lisbon, Portugal.
Elin MoeInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal.
Américo G DuarteInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal.
Luís M P LimaInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal.
Cristiana SantosInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal.
Inês L GomesCentro de Investigação da Academia Militar (CINAMIL), Unidade Militar Laboratorial de Defesa Biológica e Química (UMLDBQ), Av. Dr. Alfredo Bensaúde, 1849-012, Lisbon, Portugal.
Gonçalo S AfonsoInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal.
Ricardo VieiraCentro de Investigação da Academia Militar (CINAMIL), Unidade Militar Laboratorial de Defesa Biológica e Química (UMLDBQ), Av. Dr. Alfredo Bensaúde, 1849-012, Lisbon, Portugal.
Helena Sofia S TelesCentro de Medicina Naval-Marinha Portuguesa, Alfeite, 2810-001, Almada, Portugal.
Marisa S ReisCentro de Medicina Naval-Marinha Portuguesa, Alfeite, 2810-001, Almada, Portugal.
Manuel A Ramalho da SilvaHospital das Forças Armadas, Azinhaga dos Ulmeiros, 1649-020, Lisbon, Portugal.
Ana Margarida HenriquesInstituto Nacional de Investigação Agrária e Veterinária, I.P., Laboratório de Virologia, Av. República, Quinta do Marquês, 2780-157, Oeiras, Portugal.
Miguel FevereiroInstituto Nacional de Investigação Agrária e Veterinária, I.P., Laboratório de Virologia, Av. República, Quinta do Marquês, 2780-157, Oeiras, Portugal.
M Rita VenturaInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal.
Mónica SerranoInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal. serrano@itqb.unl.pt.
Catarina PimentelInstituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. República, 2780-157, Oeiras, Portugal. pimentel@itqb.unl.pt.
Universidade Nova de Lisboa · PTPortuguese Military Academy · PTInstituto Nacional de Investigação Agrária e Veterinária · PTHospital das Forças ArmadasMarinha PortuguesaPortuguese Naval School · PT

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Until there is an effective implementation of COVID-19 vaccination program, a robust testing strategy, along with prevention measures, will continue to be the most viable way to control disease spread. Such a strategy should rely on disparate diagnostic tests to prevent a slowdown in testing due to lack of materials and reagents imposed by supply chain problems, which happened at the beginning of the pandemic. In this study, we have established a single-tube test based on RT-LAMP that enables the visual detection of less than 100 viral genome copies of SARS-CoV-2 within 30 min. We benchmarked the assay against the gold standard test for COVID-19 diagnosis, RT-PCR, using 177 nasopharyngeal RNA samples. For viral loads above 100 copies, the RT-LAMP assay had a sensitivity of 100% and a specificity of 96.1%. Additionally, we set up a RNA extraction-free RT-LAMP test capable of detecting SARS-CoV-2 directly from saliva samples, albeit with lower sensitivity. The saliva was self-collected and the collection tube remained closed until inactivation, thereby ensuring the protection of the testing personnel. As expected, RNA extraction from saliva samples increased the sensitivity of the test. To lower the costs associated with RNA extraction, we performed this step using an alternative protocol that uses plasmid DNA extraction columns. We also produced the enzymes needed for the assay and established an in-house-made RT-LAMP test independent of specific distribution channels. Finally, we developed a new colorimetric method that allowed the detection of LAMP products by the visualization of an evident color shift, regardless of the reaction pH.

Indexed as

ColorimetryCOVID-19COVID-19 TestingHumansMolecular Diagnostic TechniquesNucleic Acid Amplification TechniquesPandemicsPortugalRNA, ViralSalivaSARS-CoV-2Sensitivity and SpecificityRNA, Viral

Identifiers

PMID34385527
PMCPMC8361189
OpenAlexW3158823402

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.