The reference laboratory further characterised sera tested positive by the ARCHITECT Anti-HCV assay and the confirmatory ELISA (Murex anti-HCV) using the ARCHITECT HCV Ag assay (Abbott) to distinguish between past infection (ARCHITECT Anti-HCV and Murex anti-HCV double positive) and current HCV infection (triple positive: ARCHITECT Anti-HCV, Murex anti-HCV, ARCHITECT HCV Ag assay). This evidence concerns the gene RENBP and infection.