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(a) Results of the enzyme‐linked immunosorbent assay (ELISA) and surface‐enhanced Raman scattering (SERS)‐based assay for severe acute respiratory syndrome coronavirus 2 lysate. (a) (i) ELISA results using a 96‐well plate and (ii) corresponding calibration curve in the range of 0–103 PFU/ml. (b) SERS spectra and (ii) corresponding calibration curve in the range of 0–104 PFU/ml. Error bars indicate standard deviations of five measurements
