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. 2022 May 20;446:137085. doi: 10.1016/j.cej.2022.137085

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Fig. 7 — Clinical assay results for six nasopharyngeal swab clinical samples (4 SARS-CoV-2 positives and 2 negatives). RT-PCR assay results for the RNA marker ORF1 of SARS-CoV-2 were used as standard control data. A higher Raman intensity ratio than 0.88 is determined to be negative, and a lower intensity ratio than 0.88 is estimated to be positive.