Dose Escalation Study of Valortim® (MDX-1303) Administered Intravenously (IV) in Healthy, Normal Subjects

Inclusion Criteria

• •1.Subject must have read, understood, and provided written informed consent 2.Subjects should be in generally good health, based upon pre-study medical history, physical examination, laboratory testing and ECG 3.Laboratory screening values (i.e., hematology, clinical chemistries and urinalysis tests) must be within study-defined ranges 4.No detectable antibody to B. anthracis Protective Antigen (PA-IgG) as measured by ELISA testing at study Screening 5.Women of childbearing potential and sexually active males may be enrolled if protocol specific contraceptives or practices are met 6.Agreement to not receive any vaccinations Day -1 through to 29 days post dosing. Vaccination against B. anthracis is prohibited during the study.8.Body Mass Index (BMI) ≥ 19 and ≤ 30. 9. Abstinence from alcohol for 24 hours prior to study drug