We observed a decreasing trend of IgG level with the increase of post-infection time (196–530 days, Fig. 5 a and Additional file 1 : Table S5a) in spite of the variation between individuals, matching the nature of IgG life-cycle [ 38 ].
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Multiplexed evaluation of immunity against SARS-CoV-2 variants using surface enhanced fluorescence from a nanostructured plasmonic chip.
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Recently, there is an increasing trend of applying plasmonic-based biosensors for viral diagnostics [ 24 ].