Fig. 5.

Immunosensor response of different lysed patient samples compared to a commercial spike protein-positive control and a negative control without the target protein. Cyan, purple, green and blue columns correspond to negative samples and high, medium and low C.T positive samples. Statistically significant differences (a) with respect to the negative control and (b) with respect to the commercial spike protein, ∗∗∗(p < 0.001), ∗∗(p< 0.01), ∗(p < 0.05) and – (p> 0,05). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)