A high voltage interface housing is provided that includes an assembly of levers within the housing that detect whether or not the HV lines are coupled to the interface housing. The display panel comprises a matrix of unit display cells arranged as rows and columns and where the cells are spaced apart to have respective row and column direction pitches. Microbead traps or barriers in the sample chamber retain the microbeads. The summing device has a positive input terminal for receiving a first input signal, a negative input terminal coupled to the output terminal of the electrical measurement circuit, and an output terminal coupled to the input terminal of the upconverter core for providing the first signal. The invention also provides anti-viral compounds that are inhibitors of viral infection andor exhibit anti-fusiogenic properties.