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Nanoparticle based detection methods. The nanoparticle based detection methods in general explore a chromatic or electrochemical change due to the presence of target virus antigen or virus particles itself. Here we represent a mechanism by which aggregation of nanoparticles cause the shift in solution color from red to purple due to the presence of virus particles. This method has been followed by many scientists and in detail by Sajjanar et al [87]
