The purpose of this study is to learn the effects an experimental vaccine (MELITAC 12.1)
combined with other substances called lipopolysaccharide (LPS; endotoxin), polyICLC, and
Montanide ISA-51. The LPS, polyICLC, and Montanide ISA-51 are included with the vaccine to
test whether they have an effect on the MELITAC 12.1 vaccine. The study will also look at
whether the experimental vaccine and these drugs cause any changes to the immune system.