Evaluation of the Safety of Varivax® in Pediatric Renal Transplant Recipients

Inclusion Criteria: Your child may be eligible for this trial if he/she: * Had a kidney transplant 1 year ago or more; * Is between 2 and 21 years of age (parent or guardian's signed informed consent required if under 18); * Is taking stable, maintenance doses of immunosuppressive drugs for his/her kidney transplant; and * Is generally in good health. Exclusion Criteria: Your child will not be eligible for this trial if he/she: * Has had any rejection episodes in the last 6 months or has other problems with their kidneys; * Was in the hospital for a major infection in the last 30 days; * Has a history of VZV infection, including chicken pox or shingles; * Has ever received a VZV vaccine, including Varivax®; * Lives with a person whose immune system does not work well; * Is allergic to certain medications; * Is unable to return for the prescribed follow-up check-ups; * Has no phone or pager; or * Has had blood or plasma transfusions or taken certain drugs in the last 6 months.