Study subjects
Two hundred sixty-five HCWs were selected for the evaluation of IFN-γ
producing T-cells by an Enzyme Linked Immuno-Spot (ELISpot) assay in
response to nine HCV genotype 4a overlapping 15mer peptide pools
covering the whole viral genome. The NLI-Institutional Review Board
(IRB) approved the study protocol, and all subjects had given informed
consent prior to enrolment. The demographic characteristics of the
participants were previously reported [14].