Phase II Trial to Assess Safety and Immunogenicity of IMVAMUNE®

This is a Phase II, randomized, open-label immunogenicity and safety study of different
immunization schedules and delivery systems (syringe and needle vs. the Stratis™) in
healthy, vaccinia-naïve adults 18 years to 40 years of age, inclusive. Approximately 352
subjects will be enrolled and randomized to one of four study arms. Study Arm A (N=88) will
receive a two dose regimen of IMVAMUNE® (1x10^8 TCID50/0.5 mL per dose) via the SC route
using a syringe and needle on Day 1 and 29. Study Arm B (N=88) will receive a two dose
regimen of IMVAMUNE® (1x10^8 TCID50/0.5 mL per dose) via the SC route using a syringe and
needle on Day 1 and 15. Study Arm C (N=88) will receive a two dose regimen of IMVAMUNE®
(1x10^8 TCID50/0.5 mL) via the SC route using a syringe and needle on Day 1 and 22. Study
Arm D (N=88) will receive a two dose regimen of IMVAMUNE® (1x10^8 TCID50/0.5 mL) via the SC
route using the Stratis™ on Day 1 and 29. Immunogenicity assessments will be performed using
ELISA and PRNT. Safety assessments will be done via solicited injection site and systemic
reactions. Unsolicited AEs will be collected until 28 days post last injection and SAEs for
the duration of the subjects' study participation. Safety laboratory assessments will be
performed at baseline and 14 days after each vaccination. Primary outcome measures: For each
subject, the peak PRNT will be defined as the highest titer among all available measurements
post second vaccination; Occurrence of solicited local injection site reactions in subjects
receiving vaccine via the Stratis™ compared to syringe and needle administration as
collected on the memory aid and by in clinic assessment. Parent protocol to sub-study
13-0027.

Inclusion Criteria:

1. 18 to 40 years of age, inclusive.

2. Read, signed, and dated informed consent document.

3. Available for follow-up for the planned duration of the study (six months after last
immunization).

4. Acceptable medical history by screening evaluation and limited physical assessment.

5. If the subject is female and of childbearing potential, negative serum or urine
pregnancy test at screening and within 24 hours prior to vaccination.

6. If the subject is female and of childbearing potential*, she agrees to practice
abstinence** or use acceptable contraception*** through 56 days after the last
vaccination in order to avoid pregnancy:

* a woman is considered of childbearing potential unless post-menopausal (>/= 1 year
without menses) or surgically sterilized (tubal ligation, bilateral oophorectomy, or
hysterectomy)

**No sexual intercourse with men (vaginal penetration by a penis, coitus)

***Acceptable contraception methods are restricted to effective devices (IUDs,
NuvaRing®) or licensed hormonal products with use of method for a minimum of 30 days
prior to vaccination, condoms with spermicidal agents, monogamous relationship with a
vasectomized partner who has been vasectomized for 6 months or more prior to study
entry, or successful Essure placement with documented confirmation test at least 3
months after the procedure, and any other FDA-approved contraceptive method

7. Negative test for HIV.

8. Alanine Aminotransferase (ALT) <1.25 times the central lab upper limit of normal.

9. Negative hepatitis B surface antigen and negative antibody to hepatitis C virus.

10. Negative urine glucose and negative or trace urine protein by dipstick or urinalysis.

11. Adequate renal function (defined as a serum creatinine not exceeding the central
lab's upper limit of normal).

12. Electrocardiogram (ECG) with no clinically significant abnormalities*

* e.g., complete left or right bundle branch block, incomplete left bundle branch
block or sustained ventricular arrhythmia, or two PVC's in a row, or ST elevation
consistent with ischemia)

13. Acceptable hematology parameters:

- Hemoglobin (Hgb) equal or above the lower limit of central lab normal
(sex-specific);

- White Blood Cell (WBC) > 3,800 and < 10,900/mm^3;

- Platelets >/=120,000/mm^3

14. Body mass index >/=18.5-< 35.

15. Be able to understand and comply with planned study procedures.

Exclusion Criteria:

1. History of immunodeficiency.

2. Typical vaccinia scar.

3. Known or suspected history of smallpox vaccination including MVA alone or as a
vector, as well as other investigational smallpox vaccines.

4. Military service prior to 1991 or after January 2003.

5. Known or suspected significant underlying illness including, but not limited to,
clinically significant liver disease, diabetes mellitus, or moderate to severe kidney
impairment.

6. Malignancy (not including squamous cell skin cancer or basal cell skin cancer unless
at the vaccination site) or history of skin cancer at the vaccination site.

7. Active autoimmune disease. Persons with vitiligo or thyroid disease (e.g., taking
thyroid hormone replacement) are not excluded.

8. History of myocardial infarction, angina, congestive heart failure, cardiomyopathy,
stroke or transient ischemic attack, or other heart condition under the care of a
doctor*

*Subjects with a not clinically relevant heart murmur, i.e., without any pathological
ECG/arrhythmias or under treatment are not excluded.

9. Systolic blood pressure >/= 150mmHg or diastolic blood pressure >/= 100mmHg.

10. Ten percent or greater risk of developing a myocardial infarction or coronary death
within the next 10 years using the National Cholesterol Education Program's (NCEP)
risk assessment tool*

*NOTE that this criterion applies only to subjects 20 years of age and older AND only
if at least one of the following apply:

- have smoked a cigarette in the past month, and/or

- have hypertension (defined as systolic blood pressure >140 mm Hg) or are on
antihypertensive medication, and/or

- have a family history of coronary heart disease in male first-degree relative
(father or brother) <55 years of age or a female first-degree relative (mother
or sister) <65 years of age

URL for NCEP risk assessment tool: http://cvdrisk.nhlbi.nih.gov/calculator.asp (if a
subject has an HDL of greater than 100mg/dl please enter 100 in the tool)

11. High-dose corticosteroid use for greater than 2 weeks duration within three months
prior to vaccination or current use of immunosuppressive medication:

- >5 mg prednisone or equivalent is considered high dose and immunosuppressive

- Corticosteroid nasal sprays for allergic rhinitis are permissible

- Persons who are using a topical steroid for mild uncomplicated dermatitis such
as poison ivy or contact dermatitis may be enrolled the day after their therapy
is completed

- Inhaled steroids for asthma are not permissible

- Oral/parenteral corticosteroids given for non-chronic conditions not expected to
recur are permissible if the length of therapy was at least 30 days prior to enrollment.

12. Medical or psychiatric condition or occupational responsibilities that preclude
subject compliance with the protocol.

13. Any history of illegal injection drug use.

14. Receipt or planned receipt of inactivated vaccine from 14 days prior to the first
vaccination through 14 days post second vaccination.

15. Receipt or planned receipt of any other live attenuated vaccine within 30 days prior
to the first vaccination through 30 days post second vaccination.

16. Use of any other experimental agent within 30 days prior to vaccination and for the
duration of the subject's participation in the study.

17. Receipt of blood products or immunoglobulin, including Rhogam, within six months
prior to vaccination.

18. Donation of a unit of blood within 56 days prior to vaccination or planned donation
prior to 28-days following the last vaccination.

19. Pregnant or breastfeeding women.

20. Active exfoliative skin disorders/conditions, current varicella zoster virus
infection, or any acute skin disorders of large magnitude, e.g., laceration requiring
sutures, burn greater than 2×2 cm.

21. Any condition that, in the opinion of the investigator, might interfere with
assessing the study objectives.

22. Known allergy to egg, aminoglycoside (including gentamicin) or chicken.

23. Study personnel.

24. Allergic reaction to any vaccine.