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(a) Schematic illustration of the working principle of dual-antigen sandwich type SQS-LFIA for SARS-CoV-2 antibody detection. (b) Representative visual results of the strips: negative, weak positive and strong positive samples. (c) Setup of the portable optical scanner for LFIA strips using fluorescent detection. (d) Representative scanning curves of fluorescent signals on the test line and control line of an LFIA strip.
