Phase 1 Randomized Double-blind Placebo Controlled Study to Evaluate Safety and PK of MEDI3902 in Healthy Adults

This is a Phase 1, randomized, double-blind, placebo-controlled, dose escalation study
evaluating the safety and tolerability of a single ascending IV dose of MEDI3902 in healthy
adult subjects 18 to 60 years of age. Approximately 40 subjects will be enrolled across 4
fixed dose cohorts at 1 study site. This study will last approximately 90 days, constituting
a screening period of up to 28 days, 1 day of investigational product administration, and a
60 day safety follow up period.

Inclusion Criteria:

1. Age 18 through 60 years at the time of screening

2. Written informed consent

3. Weight greater than or equal to (>=) 45 kilogram (kg) and less than or equal to (<=)
110 kg at screening

4. Healthy by medical history, physical examination, and baseline safety laboratory
studies

5. Systolic blood pressure (BP) less than (<) 140 millimeter of mercury (mmHg) and
diastolic BP < 90 mmHg at screening

6. Electrocardiogram (ECG) without clinically significant abnormalities at screening

7. Able to complete the follow-up period through Day 61 as required by the protocol.

8. Females of childbearing potential who are sexually active with a nonsterilized male
partner must have used a highly effective method of contraception for at least 28 days
prior to dosing with investigational product and must agree to continue using such
precautions through Day 61 of the study.

Exclusion Criteria:

1. Acute (time-limited) illness, including fever 99.5 degree Fahrenheit (0^F), on day
prior to or day of planned dosing

2. Any drug therapy within 7 days prior to Day 1 (except contraceptives or a single use
of acetaminophen, aspirin, antihistamine, or combination over-the-counter (OTC)
product that contains acetaminophen with an antihistamine, or OTC non-steroidal anti
inflammatory agent at a dose equal to or lower than that recommended on the package).
Vitamins and other nutritional supplements that are not newly introduced, ie, have
been taken for at least 30 days prior to enrolment, are not exclusionary

3. Blood drawn in excess of a total of 450 mL (1 unit) for any reason within 2 months
prior to screening

4. Receipt of immunoglobulin or blood products within 6 months prior to screening

5. Receipt of any investigational product in the preceding 90 days or expected receipt of
investigational product during the period of study follow-up, or concurrent
participation in another interventional study Receipt of any vaccine within 7 days
prior to investigational product dosing or planned receipt within 61 days after
investigational product dosing except for influenza vaccine administered at least 28
days after dosing

6. Previous receipt of a mAb

7. Immunodeficiency due to illness, including human immunodeficiency virus (HIV)
infection, or due to drugs, including any course of glucocorticoid therapy exceeding 2
weeks of prednisone or equivalent at a dose of 20 mg daily or every other day within 6
months prior to screening. HIV testing must be negative at screening

8. History of allergic disease or reactions likely to be exacerbated by any component of
the investigational product

9. Either history of active infection with hepatitis B or C

10. Aspartate aminotransferase (AST), alanine aminotransferase (ALT), or serum creatinine
above the upper limit of normal (ULN) or hemoglobin, white blood cell count, or
platelet count below the lower limit of normal at screening and in the predose blood
sample

11. Pregnant or nursing mother

13. History of alcohol or drug abuse within the past 2 years.