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. 2021 Mar 13;181:113160. doi: 10.1016/j.bios.2021.113160

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Fig. 4 — (a) Quantification of SP of SARS-CoV-2 from 2 to 200 ng/mL. The inset illustrates that the LOD of SP is 1.6 ng/mL. (b) Quantification of NP of SARS-CoV-2 from 2 to 200 ng/mL. The inset illustrates that the LOD of NP is 2.2 ng/mL (c) quantification of virus culture of SAES-CoV-2. (d) The real photo of the fluorescence sensor and the fluorescence image of the test strip during detection.