BioMed research international · 2026
Evaluation of the Analytical Performance of the STANDARD Q COVID-19 Antigenic Test in Suspected COVID-19 Cases in Bobo-Dioulasso, Burkina Faso.
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Sawadogo Yacouba, Ilboudo Aicha, Sombie Herman Karim, Samba Jessica Julie Chantal, Michodigni Noutin Fernand, Ouattara Cheick Ahmed, Belem Abdoul Aziz, Ouédraogo Abdoul-Salam
Аннотация
BACKGROUND: The use of alternative technique such as rapid antigen diagnostic tests (Ag-RDTs) is needed in countries with limited resources for fast tracking of COVID-19 cases. This study evaluated the performance of the STANDARD Q COVID-19 antigen test compared with reverse transcriptase polymerase chain reaction (RT-PCR) among suspected COVID-19 cases using nasopharyngeal and/or oropharyngeal swabs in Bobo-Dioulasso, Burkina Faso.
METHODS: A cross-sectional study was conducted from April to September 2021. The respiratory secretions of suspected COVID-19 cases were collected at the Virology Laboratory of Sourô Sanou University Hospital in Bobo-Dioulasso. The respiratory secretions consisted of nasopharyngeal or combined nasopharyngeal/oropharyngeal swabs. Each sample was analyzed using the STANDARD Q COVID-19 Ag test and RT-PCR on the Abbott m2000 RealTime system.
RESULTS: A total of 152 respiratory specimens were collected from suspected COVID-19 cases and processed in this study. The sensitivity and specificity of the Ag-RDT were 26.32% (9.15-57.20) and 98.65% (92.7-99.9), respectively, in the suspected cases with nasopharyngeal swabs from suspected cases, while a sensitivity of 25.0% (3.2-65.1) and a specificity of 98.65% (92.7-99.9) were shown with combined nasopharyngeal/oropharyngeal swabs from suspected cases. The accuracy and Cohen's kappa of the test were 83.87% and 0.36 in suspected cases with nasopharyngeal swabs from suspected cases, while they were 83.37% and 0.32 in oropharyngeal swabs. In our study, Ag-RDT was not sensitive on the specimens of suspected COVID-19 cases with Ct values ≥ 20, whereas its sensitivity increased to 41.18% (18.4-67.1) on specimens with Ct < 20.
CONCLUSION: The study findings have shown that the Ag-RDT is useful in suspected COVID-19 cases. However, the sensitivity of the STANDARD Q COVID-19 Ag test was low with minimal agreement in comparison to RT-PCR on the Abbott m2000rt system.
METHODS: A cross-sectional study was conducted from April to September 2021. The respiratory secretions of suspected COVID-19 cases were collected at the Virology Laboratory of Sourô Sanou University Hospital in Bobo-Dioulasso. The respiratory secretions consisted of nasopharyngeal or combined nasopharyngeal/oropharyngeal swabs. Each sample was analyzed using the STANDARD Q COVID-19 Ag test and RT-PCR on the Abbott m2000 RealTime system.
RESULTS: A total of 152 respiratory specimens were collected from suspected COVID-19 cases and processed in this study. The sensitivity and specificity of the Ag-RDT were 26.32% (9.15-57.20) and 98.65% (92.7-99.9), respectively, in the suspected cases with nasopharyngeal swabs from suspected cases, while a sensitivity of 25.0% (3.2-65.1) and a specificity of 98.65% (92.7-99.9) were shown with combined nasopharyngeal/oropharyngeal swabs from suspected cases. The accuracy and Cohen's kappa of the test were 83.87% and 0.36 in suspected cases with nasopharyngeal swabs from suspected cases, while they were 83.37% and 0.32 in oropharyngeal swabs. In our study, Ag-RDT was not sensitive on the specimens of suspected COVID-19 cases with Ct values ≥ 20, whereas its sensitivity increased to 41.18% (18.4-67.1) on specimens with Ct < 20.
CONCLUSION: The study findings have shown that the Ag-RDT is useful in suspected COVID-19 cases. However, the sensitivity of the STANDARD Q COVID-19 Ag test was low with minimal agreement in comparison to RT-PCR on the Abbott m2000rt system.