ORF31 is one of five glycoprotein ORFs in VZV genome. It encodes for gB, a type I membrane protein containing 868 aa which in mature form exists as a highly glycosylated disulfide-linked heterodimer (Annu Rev Microbiol 1990. 44: 59-80). VZV gB is the second most abundant and immunogenic surface glycoprotein and one of the most conserved molecules in the herpesvirus genome J Gen Virol 1986. 67 (Pt 9): 1759-1816., J Virol 1985. 56: 333-336). Our anti-VZV31 antibody VZ 31C.09 works in ELISA (on immunogen), IF (on VZV infected cells) and each LOT is validated for Western blot of VZV infected cell lysates, where it gives a pattern as described in J Virol. 2013 Jun;87(12):6943-54).