Fig. 2.

Demonstrating the outcome of the LAMP assay using a colorimetric change to detect presence of COVID-19 viral DNA in A) simulated patient samples employed by El-Tholoth et al., 2020 (darker colour represents a positive assay, while lighter colour represents negative assay result), and B) actual patient samples (n = 7) from Wuhan province in China, analysed by Zhang et al., 2020 (yellow colour represents positive assays, while pink tubes represent negative assay results. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)