COVIDFast: A high-throughput and RNA extraction-free method for SARS-CoV-2 detection in swab (SwabFAST) or saliva (SalivaFAST)
Qiu, Y.; Lu, L.; Halven, A.; Terrio, R.; Yuldelson, S.; Dougal, N.; Galbo, F.; Lu, A.; Gao, D.; Blomquist, B.; Zevallos, J.; Harry, B.; Yao, X.; Lu, S.-L.
Show abstract
There is an urgent need of having a rapid, high throughput, yet accurate SARS-COV-2 PCR testing to control the COVID19 pandemic. However, the RNA extraction step in conventional PCR creates a major bottle neck in the diagnostic process. In this paper we modified the CDC COVID-19 assay and developed an RNA-extraction free RT-qPCR assay for SARS-CoV-2, i.e. COVIDFast. Depending on sample types, the assay is further divided into SwabFAST, which uses anterior nares nasal swab, and SalivaFAST, which uses saliva. By utilizing the proprietary buffer for either swab or saliva samples, the performance of SwabFAST or SalivaFAST is equivalent to RNA-extraction SARS-CoV-2 RT-qPCR in both contrived and clinical samples. The limit of detection of either assay is 4 copies/L. We further developed a semi-automatic system, which is easy to adapt by clinical lab for implementation of a high-throughput SARS-CoV-2 test. Working together with the COVIDCheck Colorado, we have tested over 400,000 samples using COVIDFast (83.62% SwabFAST and 16.38% SalivaFAST) in less than a year, resulting in significant clinical contribution in the battle against COVID-19 during the pandemic.
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