Background The reactivation of varicellazoster virusfrom latency causes zoster and is common among recipients ofhematopoietic-cell transplants.
Methods We randomly assigned patients who were scheduled toundergo autologous hematopoietic-cell transplantation for non-Hodgkin'sor Hodgkin's lymphoma to receive varicella vaccine or no vaccine.Heat-inactivated, live attenuated varicella vaccine was givenwithin 30 days before transplantation and 30, 60, and 90 daysafter transplantation. The patients were monitored for zosterand for immunity against varicellazoster virus for 12months.
Results Of the 119 patients enrolled, 111 received a transplant.Zoster developed in 7 of 53 vaccinated patients (13 percent)and in 19 of 58 unvaccinated patients (33 percent) (P=0.01).After two patients in whom zoster developed before transplantationwere excluded, the respective rates were 13 percent and 30 percent(P=0.02). In vitro CD4 T-cell proliferation in response to varicellazostervirus (expressed as the mean stimulation index) was greaterin patients who received the vaccine than in those who did notat 90 days, after three doses (P=0.04); at 120 days, after allfour doses (P<0.001); at 6 months (P=0.004); and at 12 months(P=0.02). The risk of zoster was reduced for each unit increasein the stimulation index above 1.6; a stimulation index above5.0 correlated with greater than 93 percent protection. Induration,erythema, or local pain at the injection site was observed inassociation with 10 percent of the doses.
Conclusions Inactivated varicella vaccine given before hematopoietic-celltransplantation and during the first 90 days thereafter reducesthe risk of zoster. The protection correlates with reconstitutionof CD4 T-cell immunity against varicellazoster virus.
Source Information
From the Departments of Pediatrics (A.H., H.A., M.R., M.S., A.M.A.), Health Research and Policy (R.M.W.), and Medicine (K.B.), Stanford University School of Medicine, Stanford, Calif.
Address reprint requests to Dr. Arvin at the Department of Pediatrics, Stanford University School of Medicine, 300 Pasteur Dr., Rm. G312, Stanford, CA 94305-5208.
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