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Rapid screening of the SARS-CoV-2 VOC 202012/01 B.1.1.7 variant using three different assays
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  • Cristina Riazzo,
  • Rosa Pedraza-Merino,
  • Laura Merino,
  • Pedro Camacho,
  • Jose A Lepe-Jimenez,
  • Luis Martinez-Martinez,
  • Manuel Causse-del Rio
Cristina Riazzo
Reina Sofia University Hospital

Corresponding Author:[email protected]

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Rosa Pedraza-Merino
Reina Sofia University Hospital
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Laura Merino
Virgen del Rocio University Hospital
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Pedro Camacho
Virgen del Rocio University Hospital
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Jose A Lepe-Jimenez
Virgen del Rocio University Hospital
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Luis Martinez-Martinez
Reina Sofia University Hospital
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Manuel Causse-del Rio
Reina Sofia University Hospital
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Abstract

Background The aim of this study was to evaluate three commercially available methods (Allplex SARS-CoV-2 Assay, Allplex SARS-CoV-2/FluA/FluB/RSV Assay and Novaplex SARS-CoV-2 Variants I Assay) for screening of the SARS-CoV-2 VOC 202012/01 B.1.1.7 variant. Methods A total of 160 nasopharyngeal samples (150 positive and 10 negative for SARS-CoV-2) were tested with all three molecular assays. Next-generation sequencing (NGS) was used as the reference method to determine analytical performance. Results Total (100%) agreement was found for SARS-CoV-2 detection with all three assays. For B.1.1.7 screening, the sensitivity of the Allplex SARS-CoV-2 Assay, the Allplex SARS-CoV-2/FluA/FluB/RSV Assay and the Novaplex SARS-CoV-2 Variants I Assay (Seegene Inc.) were 94.5%, 98.7% and 100 %, respectively, while the specificities of the assays were 98.6%, 81.7% and 100%, respectively. Conclusions Although the best results for identifying the B.1.1.7 variant in this study were achieved with the Novaplex Variants I Assay, the three approaches evaluated can be considered cost-effective primary screening tools to rapidly monitor the VOC 202012/01 B.1.1.7 variant.