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SARS-CoV-2 Omicron detection by antigen tests using saliva

The Omicron emerged in November 2021 and became the predominant SARS-CoV-2 variant globally. It spreads more rapidly than ancestral lineages and its rapid detection is critical for the prevention of disease outbreaks. Antigen tests such as immunochromatographic assay (ICA) and chemiluminescent enzym...

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Detalles Bibliográficos
Autores principales: Murakami, Kaoru, Iwasaki, Sumio, Oguri, Satoshi, Tanaka, Kumiko, Suzuki, Rigel, Hayasaka, Kasumi, Fujisawa, Shinichi, Watanabe, Chiaki, Konno, Satoshi, Yokota, Isao, Fukuhara, Takasuke, Murakami, Masaaki, Teshima, Takanori
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Author(s). Published by Elsevier Ltd. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9472459/
https://www.ncbi.nlm.nih.gov/pubmed/36118305
http://dx.doi.org/10.1016/j.jcvp.2022.100109
Descripción
Sumario:The Omicron emerged in November 2021 and became the predominant SARS-CoV-2 variant globally. It spreads more rapidly than ancestral lineages and its rapid detection is critical for the prevention of disease outbreaks. Antigen tests such as immunochromatographic assay (ICA) and chemiluminescent enzyme immunoassay (CLEIA) yield results more quickly than standard polymerase chain reaction (PCR). However, their utility for the detection of the Omicron variant remains unclear. We herein evaluated the performance of ICA and CLEIA in saliva from 51 patients with Omicron and 60 PCR negative individuals. The sensitivity and specificity of CLEIA were 98.0% (95%CI: 89.6–100.0%) and 100.0% (95%CI: 94.0–100.0%), respectively, with fine correlation with cycle threshold (Ct) values. The sensitivity and specificity of ICA were 58.8% (95%CI: 44.2-72.4%) and 100.0% (95%CI: 94.0–100.0%), respectively. The sensitivity of ICA was 100.0% (95%CI: 80.5–100.0%) when PCR Ct was less than 25. The Omicron can be efficiently detected in saliva by CLEIA. ICA also detects high viral load Omicron using saliva.