OUTLINE: This is a randomized study. Patients are stratified according to HLA-2 typing (positive vs negative vs unknown). Patients are randomized to one of three treatment arms. Arm I: Patients receive intramuscular fowlpox prostate specific antigen (PSA) vaccine at weeks 0, 6, 12, and 18. Arm II: Patients receive intramuscular fowlpox PSA vaccine at weeks 0, 6, and 12 and intradermal vaccinia PSA vaccine at week 18. Arm III: Patients receive intradermal vaccinia PSA vaccine at week 0 and intramuscular fowlpox PSA vaccine at weeks 6, 12, and 18. Patients are followed at week 24, then every 3 months until year 2, every 6 months until year 5, and annually thereafter.