The purpose of this study is to determine the best vaccination strategy over a 6-month period using recombinant hepatitis B vaccine (Engerix-B) in peritoneal dialysis patients. Current data show that the traditional Engerix-B vaccine dose (40 micrograms) does not always lead to protective and long-lasting hepatitis B surface antibody. The investigators, therefore, decided to compare the usual 40-micrograms with an 80-microgram dose strategy of vaccine protection.