Single Dose, Weight-Based, Dose-Escalation Study With Intravenous ETI-204 in Adult Volunteers

Inclusion Criteria: Subjects who meet all of the criteria shown below may be included in the study.

1. Healthy male or female subjects between 18 and 65 years of age.
2. Subjects with a body mass index (BMI) > 18.5 and < 35 kg/m2.
3. Female subjects of childbearing potential (not post-menopausal or surgically sterile) must have a negative urine β-hCG pregnancy test at Screening.
4. Female subjects of childbearing potential (not post-menopausal or surgically sterile) must use a medically accepted method of contraception for the duration of the study, including the 70-day follow-up period. Acceptable methods of contraception include abstinence, a barrier method with spermicide, an intrauterine device (IUD) or a hormonal contraceptive (oral, transdermal, implanted, or injected) in conjunction with a barrier method.
5. Male subjects must agree to practice abstinence or to use a condom with spermicide for the duration of the study, including the 70-day follow-up period.
6. The subject has no clinically significant abnormalities on the clinical laboratory tests (hematology, clinical chemistry, or urinalysis) or ECG at Screening.
7. Subject provides written informed consent.

Exclusion Criteria:Subjects who meet any of the criteria below will be excluded from participation in the study.

1. Subject requires regular use of a medication for a chronic condition.
2. Subject has a clinically significant comorbidity that would interfere with the completion of the study procedures or objectives, or would compromise the subject's safety.
3. Subject has a systolic blood pressure (BP) > 140 mm Hg or a diastolic BP > 90 mm Hg.
4. Subject has a systolic BP < 90 mm Hg.
5. Subject has current suspected drug or alcohol abuse as specified in the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM-IV-TR) (American Psychiatric Association 2000).
6. Subject has a positive alcohol or drug test result at Screening and on Day -1
7. Subject has received an investigational agent within 30 days or 5 half-lives (whichever is longer) of Screening.
8. Subject has congenital or acquired immunodeficiency syndrome.
9. Subject has a positive test for Hepatitis B (surface antigen), Hepatitis C, or human immunodeficiency virus (HIV) at Screening.
10. Subject smokes > 3 cigarettes per day.
11. Subject has ever had prior treatment for anthrax exposure, prior anthrax infection, prior immunization with any anthrax vaccine or prior treatment with an investigational anthrax treatment