The ORF53, which is predicted to be a tegument protein, consists of 331 amino acids and plays a critical role in cytoplasmic virus egress. ORF53 participates in the final step of tegumentation and envelope acquisition within the host cytoplasm. It is predominantly located to the trans-Golgi network of the infected host cell together with ORF7 (virion phosphoprotein). Our anti – VZV ORF 53 antibody VZ 53.12 (described in J Virol. 2013 Jun;87(12):6943-54) works in ELISA (on immunogen) and each LOT was validated for Western blot (of VZV infected cell lysates) where it specifically recognizes a protein species of ~38 kDa in lysates obtained from VZV infected cells.