The objective of the present randomized study is to evaluate the optimum strategy of recombinant hepatitis B vaccination in the maintenance of protective anti-HBs antibody among end-stage renal disease patients on peritoneal dialysis. This study is designed to establish whether a three-dose schedule of 80 microgram Engerix-B vaccine could maintain protective antibody response among dialysis patients. The secondary aim is to identify the effects of dosing on various subgroups of dialysis patients.