Panblok H7 Vaccine Adjuvanted With AS03 or MF59

This is a randomized, double-blinded, phase 2 study to assess safety and immunogenicity of
Panblok H7 vaccine at three antigen dose levels (3.75, 7.5, and 15 μg) adjuvanted with AS03
or MF59. The main purpose of this study is to assess the safety and ability of the
recombinant Panblok H7 influenza vaccine adjuvanted with AS03 or MF59 to generate an immune
response after 2 doses separated by 28 days in healthy males and nonpregnant females, aged 18
to 49 years, inclusive. The expected study duration is approximately 13.5 months per
participant.

Inclusion Criteria:

1. Male or nonpregnant female 18 to 49 years of age, inclusive, at the time of the first
study vaccination.

2. Provide written informed consent prior to the initiation of any study-related
procedures.

3. Are able to understand and comply with planned study procedures.

4. Have a stable health status based on site investigator's clinical judgment, as
established by physical examination, vital signs, and medical history.

5. Have access to a consistent and reliable means of telephone contact, which may be in
the home, workplace, or by personal mobile electronic device.

6. Agree to stay in contact with the study site for the duration of the study, have no
current plans to move from the study area, and agree to provide updated contact
information as necessary.

Exclusion Criteria:

1. Have had a prior severe reaction to any influenza vaccine or have a known allergy to
squalene-based adjuvants.

2. Women who are pregnant or breast feeding. Women of childbearing potential must have a
negative urine pregnancy test at screening and within 24 hours prior to each
vaccination.

Women of childbearing potential are defined as postmenarcheal and premenopausal
females capable of becoming pregnant. This does not include females who meet any of
the following conditions: menopausal >12 months, tubal ligation >12 months, bilateral
salpingo-oophorectomy, or hysterectomy.

3. Women of childbearing potential who refuse to use an acceptable method of birth
control from screening to Day 50 (Visit 7) or, if sexually active with a male partner,
who have not used a reliable birth control method during the 2 months prior to
screening.

Adequate contraception is defined as a contraceptive method with a failure rate of
less than 1% per year when used consistently and correctly and when applicable, in
accordance with the product label, for example: abstinence from penile-vaginal
intercourse; oral contraceptives, either combined or progestogen alone; injectable
progestogen; implants of etonogestrel or levonorgestrel; estrogenic vaginal ring;
percutaneous contraceptive patches; intrauterine device or intrauterine system; male
partner sterilization at least 6 months prior to the female participant's Screening
Visit, and this male is the sole partner for that participant (the information on the
male partner's sterility can come from the site personnel's review of the participant
medical records or interview with the participant on her medical history); male condom
combined with a vaginal spermicide (foam, gel, film, cream, or suppository); male
condom combined with a female diaphragm, either with or without a vaginal spermicide
(foam, gel, film, cream, or suppository).

4. Have immunosuppression as a result of an underlying illness or treatment, or use of
anticancer chemotherapy or radiation therapy (cytotoxic) within the preceding 36
months, or plans to receive immunosuppressive therapy/cytotoxic treatment during study
participation.

5. Have an active neoplastic disease or a history of any hematologic malignancy. However,
participants with superficial skin cancer who do not require intervention other than
local excision are not excluded.

6. Have long-term use (≥14 consecutive days) of glucocorticoids including oral or
parenteral prednisone or prednisone equivalent (>20 mg total dose per day) or
high-dose inhaled steroids (>800 µg/day of beclomethasone dipropionate or equivalent)
within 1 month prior to screening in this study. However, participants on low-dose
inhaled steroids (≤800 µg/day of beclomethasone dipropionate or equivalent) or topical
steroids are not excluded.

7. History of schizophrenia, bipolar disease, psychosis, or severe personality disorder.

8. History of hospitalization for psychiatric illness, attempted suicide, or having been
deemed a danger to self or others within the past 10 years.

9. Have received immunoglobulin or other blood product (with the exception of Rho[D]
immune globulin) within the 3 months prior to screening in this study.

10. Have received any live vaccines within 4 weeks or inactivated or recombinant protein
vaccines within 2 weeks prior to screening in this study or plan to receive such
vaccines (including seasonal influenza vaccines) from screening through 21 days
following the second dose of the study vaccine (Screening Visit through Day 50).

11. Have an acute or chronic medical condition that, in the opinion of the site
investigator, would render vaccination unsafe or would interfere with the evaluation
of responses. This includes all PIMMCs such as Guillain Barré syndrome, narcolepsy,
and current or history of autoimmune or chronic inflammatory disease.

12. Have an acute illness, including body temperature greater than 100.4°F, at screening,
immediately prior to each vaccination or, per participant report, within 3 days prior
to each vaccination in this study.

13. Received an experimental agent (vaccine, drug, biologic, device, blood product, or
medication) within 1 month prior to screening in this study or expect to receive an
experimental agent during the study period.

14. Are participating or plan to participate in another interventional clinical trial
(either active or follow up phase) during the study period.

15. Participated in an A(H7) influenza vaccine study in the past or have a history of
A(H7) influenza infection prior to vaccination in this study.

16. Have known human immunodeficiency virus, hepatitis B, or hepatitis C infection (based
on medical history).

17. Have a history of alcohol or drug abuse in the last 5 years.

18. Have a body mass index >35 kg/m2.

19. Have a first degree relative with narcolepsy.

20. Have any laboratory test result or clinical findings (including vital signs) that
singly or in combination are likely to unfavorably alter the risk-benefit of
participation or to confound study safety or immunogenicity results. participants
cannot be rescreened based on abnormal laboratory test results.

21. Alanine aminotransferase (AST) >2 times the upper limit of normal (ULN), or bilirubin
>1.5 times the ULN unless isolated Gilbert's syndrome. participants cannot be
rescreened based on abnormal laboratory test results.