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Ex vivo ELISpot assay for VZV-specific T-cell response. VZV-specific T-cell response to gE and IE63 35 VZV-seropositive healthy subjects and 7 VZV-seronegative healthy subjects. The cut-off of positive responses was calculated as the mean of the response in VZV-seronegative subjects plus two standard deviations. Ctrl: Ex vivo ELISpot assay measured against medium only.
