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. 2021 Jul-Aug;47(5):332-336.
doi: 10.1016/j.semerg.2021.04.003. Epub 2021 Apr 27.

[Internal validity of a rapid test for COVID-19 antigens in a nursing home]

[Article in Spanish]
Affiliations

[Internal validity of a rapid test for COVID-19 antigens in a nursing home]

[Article in Spanish]
C Diez Flecha et al. Semergen. 2021 Jul-Aug.

Abstract

Introduction: RT-qPCR is the reference test for the detection of SARS-CoV-2 infection, however, rapid antigen detection tests (RADT) are now available. In this work, the internal validity of the RADT was evaluated in the context of an outbreak in a nursing home.

Methods: Nasopharyngeal exudate samples were analyzed by RADT and RT-qPCR from 61 residents of a nursing home. The sensitivity and specificity of RADT with respect to RT-qPCR was calculated.

Results: Specificity was 100% (95% CI 54.1-100.0), while sensitivity in asymptomatic people was 70.3% (95% CI 53.0-84.1) and in symptomatic people 83.3% (95% CI 51.6-97.9).

Conclusions: The RADTs are sufficiently sensitive and specific to be used as screening tests in nursing homes, especially in situations of outbreaks or suspected outbreaks due to the presence of symptoms.

Introducción: La RT-qPCR es la prueba de referencia para la detección de la infección por SARS-CoV-2; sin embargo, en la actualidad se dispone de pruebas rápidas de detección de antígenos (PRDA). En este trabajo se evaluó la validez interna de la PRDA en el contexto de un brote en una residencia de mayores.

Métodos: Se analizaron muestras de exudado nasofaríngeo mediante PRDA y RT-qPCR de 61 residentes de una residencia de mayores. Se calculó la sensibilidad y especificidad de la PRDA con respecto a la RT-qPCR.

Resultados: La especificidad fue del 100% (IC 95% 54,1-100,0), mientras que la sensibilidad en asintomáticos fue del 70,3% (IC 95% 53,0-84,1) y en los sintomáticos del 83,3% (IC 95% 51,6-97,9).

Conclusiones: Las PRDA son lo suficientemente sensibles y específicas para ser utilizadas como pruebas de cribado en las residencias de mayores, especialmente es situación de brotes o sospecha del mismo por la presencia de sintomáticos.

Keywords: Antigen; Antígenos; COVID-19; Detección; Detection; Epidemiology; Epidemiología; Nursing home; Residencias; SARS-CoV-2.

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