PEDIATRICS Vol. 99 No. 1 January 1997, pp. 35-39

Varicella and Zoster in Children After Kidney Transplantation: Long-term Results of Vaccination

Received Dec 4, 1995; accepted Feb 28, 1996.

Michel Broyer^*, Marie José Tete^*, Genevieve Guest^*, Marie France Gagnadoux^*, and Christine Rouzioux

From the ^* Department of Pediatric Nephrology, and  Department of Virology, Hôpital Necker-Enfants Malades, Paris, France.

Objective.  To determine the long-term prevalence of varicella infection and herpes zoster after kidney transplantation and to assess the effectiveness of varicella immunization with the Oka attenuated strain.

Methods.  This study involved 704 children and adolescents who received a kidney graft in our institution from 1973 to 1994 and had routinely been given varicella vaccine beginning in 1980 in preparation for transplantation.

Results.  After vaccination 62% of these patients still had varicella/zoster (VZ) antibodies at 1 year and 42% after 10 years. After transplantation the incidence of varicella was significantly lower, 26/212 (12%), in patients who received immunization than in those who did not and had no history of varicella, 22/49 (45%). The disease was also significantly less severe in the vaccinated patients (three deaths among naive patients vs none among vaccinees). In the vaccinees, varicella infection was observed only in those who did not develop or lost VZ antibodies; in addition, 21 patients of this subgroup had an asymptomatic seroconversion. Four of the 415 patients with a history of varicella had another episode of benign varicella after grafting. Herpes zoster was observed in 76 of the 704 patients included in the study. The prevalence differed according to VZ status at the time of grafting: 13% in patients with a history of varicella, 7% in the vaccinees, and 38% in the naive patients at grafting who developed varicella. Three rejection episodes occurred in association with a varicella episode and four with a zoster episode, but graft function was only transiently impaired, and as a whole varicella or zoster did not significantly affect graft function or survival.

Conclusion.  Naive VZ patients with a kidney graft are at risk to develop severe varicella and this may be effectively prevented by available immunization.

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