Immunogenicity, Safety, and Tolerability of rF1V-1018 Vaccine in Adults 18 to 55 Years of Age

This dose-finding study will evaluate the immunogenicity, safety, and tolerability of multiple doses and regimens of rF1V-1018 vaccine in healthy adults. Immunogenicity blood samples will be drawn at several timepoints during the study. Participants will return to the clinic for periodic visits for study specific evaluations including evaluation of immunogenicity and safety. Safety assessments will be done at regular intervals through the end of the trial. Six dose regimens will be tested in Part 1 of the study. Up to two dose regimens from Part 1 will be chosen for Part 2 of the study.