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This study will compare the immune system response to booster vaccines for tetanus/diphtheria and hepatitis B in healthy volunteers with that of patients who have had a blood transplant. (A blood transplant is an infusion of donated stem cells-i.e., cells that mature into white blood cells, red blood cells and platelets). The study will also look at how age of the blood cell donor and recipient, the type of blood transplant, the amount of certain types of white cells in donor blood, and other variables may influence the vaccine response among the transplant patients. This study includes normal volunteers and patients who have had a blood transplant. Healthy volunteers between the ages of 18 and 60 who have previously been vaccinated with the hepatitis B or tetanus/diphtheria vaccine and have not had hepatitis B may be eligible for this study. Patients enrolled in a blood cell transplant study at NIH who are between 5 and 60 years old, have been vaccinated against tetanus/diphtheria, and have not had hepatitis B may be eligible. Candidates will be screened with a medical history and blood tests. Those enrolled in the study will have about 2 tablespoons of blood drawn before vaccination with a standard tetanus/diphtheria booster shot. Volunteers who have previously been vaccinated with the hepatitis B vaccine and all blood transplant patients will also receive a hepatitis B vaccination. Participants will have blood drawn (from 1 to 5 tablespoons) up to once a week after vaccination for no more than 8 weeks to evaluate the immune response to vaccination.