Effective varicella vaccination in VZV seronegative kidney transplant candidates. Equal VZV-IgG response in transplanted and not transplanted patients. VZV-IgG seroconversion in 77% of vaccinees. One year after vaccination, 67% of patients maintained positive VZV-IgG. Significant VZV-specific CD4+ memory T-cell increment in 82% of vaccinees.