Grapheal is developing a diagnostic test based on saliva sampling to screen Covid-19 infection rapidly in response to the current sanitary crisis. This all-electronic test is an antigen immunoassay: it detects the virus's presence and not the immune response commonly found in current-generation rapid tests. It allows the result to be electronically captured at the heart of the device, which speeds up the diagnosis and enables the result's secure digital transfer. 

When sensitized with appropriate antibodies, which target the proteins at the surface of the SARS-CoV-2 virus, graphene sees its electrical conductance affected by the virus's presence. It can detect the virus in body fluids, thus providing highly efficient diagnostic tests.

Video showing the principle of operation