Disseminated VZV infection can be life threatening in renal transplant recipients with a global mortality rate of 30%. This rate seems to have decreased since 1995. Seropositive VZV patients with disseminated infection are not protected from fatal outcome.
Rommelaere, M., Maréchal, C., Yombi, J. C., Goffin, E., & Kanaan, N. (2012). Disseminated varicella zoster virus infection in adult renal transplant recipients: outcome and risk factors. Transplantation Proceedings, 44(9), 2814-2817. https://doi.org/10.1016/j.transproceed.2012.09.090 (Original work published 2012)