1. Males and nonpregnant females between the ages of 18 and 49 years, inclusive. 2. Women of childbearing potential* must agree to practice adequate contraception** for the 28-day period before Day 0 through 90 days after the third study injection. * A woman is considered of childbearing potential unless surgically sterile (tubal ligation, bilateral oophorectomy, or hysterectomy) or post-menopausal (>/=1 year). **Acceptable birth control methods include but are not limited to: abstinence from sexual intercourse with men; monogamous relationship with a vasectomized partner; barrier methods (condoms, diaphragms, spermicides, and intrauterine devices); and licensed hormonal methods. 3. In good health, as judged by the investigator and determined by vital signs*, medical history, and a targeted physical examination. * Temperature <38°C, heart rate </=100 bpm and >54 bpm, systolic blood pressure </=140 mmHg and >89 mmHg, diastolic blood pressure </=90 mmHg and >/=60 mmHg. NOTE: Athletically trained subjects with a pulse >/=45 may be enrolled at the discretion of the principal investigator or designated licensed clinical investigator. 4. Screening laboratory values must be within site normal limits, though trace urine protein is acceptable. -Blood hemoglobin -White blood cell (WBC) count -Neutrophil count -Platelets -Creatinine -AST -ALT -Bilirubin (total) -Glucose (random, must be less than 140) -Urine dipstick for protein and glucose (negative to trace protein are acceptable) -Negative Quantiferon-TB Gold test -Negative HIV 1/2 antibody, (HBsAg), and Hepatitis C virus (HCV) antibody NOTE: See Appendix D for site normal values. Creatinine values lower than the normal range may be acceptable if the PI or a designated licensed clinician determines that these laboratory findings are not clinically significant. HIV and hepatitis C viral load PCR testing may be performed for individuals suspected of having indeterminate antibody testing. For African American participants, a WBC of >/= 3.5 k/mm^3 is acceptable. 5. Able to understand and comply with planned study procedures and willing to be available for all study-required procedures, visits and calls for the duration of the study. 6. Provide written informed consent before initiation of any study procedures. 7. Willing to abstain from donating whole blood or blood derivatives until 90 days after the final study injection.