A Study to Assess Immune Response in Pediatric Kidney Transplant Recipients Treated With Daclizumab (Zenapax)

Diphtheria and Tetanus Toxoid (DT) will be administered intramuscularly as a 1/3 dilution (0.33 flocculation units). The participants will be rechallenged with DT 6 months after Day 29 if failed to show \>=1.5 fold increase in lymphocyte proliferative response but have a humoral response.

The fifth dose (1 milligram per kilogram \[mg/kg\]) of daclizumab will be administered in this study to participants who already received four doses (one dose at 1 mg/kg within 24 hours post-transplant and then every other week for 3 doses).

KLH will be administered intradermally with a dose of 250 mcg for participants aged 2 to less than 12 years, and 500 mcg for participants aged 12 to 19 years. The participants will be rechallenged with KLH 6 months after Day 29 if failed to show specified increase in lymphocyte proliferative response or humoral response.