This is a Phase 2/3, randomized, multicenter, double-blind, dose-response study to evaluate the safety, immunogenicity, and efficacy of UB 612 in 2 age groups, adults 18 to 59 and ≥60 years of age with or without comorbidities.
This Phase 2/3 trial will enroll a total of 7320 male and female subjects randomized in a
double-blind manner to receive either UB-612 or placebo. Assignment will be stratified by age
(18 to 59 years and ≥60 years) and by presence/absence of comorbidities.
All subjects will receive 2 doses of the study vaccine, separated by 28 days, as an
intramuscular (IM) injection.
Phase 2 and Phase 3 will start simultaneously; Phase 2 will enroll all Strata #1 to #4; Phase
3 will enroll Stratum #1 until the Data and Safety Monitoring Board (DSMB) has reviewed Phase
2 data through Day 43 and endorsed enrolment of Strata #2 to #4. All subjects in Phase 2 and
Phase 3 will be followed for safety and efficacy.
This Phase 2/3 study also contains a Safety and Immunogenicity Cohort (N=1300) consisting of
1000 SARS-CoV-2 seronegative subjects (320 subjects enrolled in Phase 2 and 680 subjects
enrolled in Phase 3) and 300 SARS-CoV-2 seropositive subjects enrolled in Phase 3.
Biological: UB-612
100 µg [microgram] of an experimental study vaccine
Other: Placebo
Placebo is a 0.9% sodium chloride (normal saline) injection
Inclusion Criteria:
1. Understands and agrees to comply with the study procedures and provides written
informed consent.
2. Passes written comprehension test outlining study procedures.
3. Male or female, aged 18 to 59 years or aged >60 years at randomization.
4. Canadian Frailty Scale score of 0 to 6 (see Appendix 1).
5. Women of childbearing potential (WOCBP) and men must agree to practice medically
effective contraception from 28 days before the first vaccination until 1 month after
the last vaccination (i.e., a 3-month period). The acceptable effective contraception
methods include the following:
1. Barrier method (such as condoms, diaphragm, or cervical cap) used in conjunction
with spermicide
2. Intrauterine device
3. Prescription hormonal contraceptive taken or administered via oral (pill),
transdermal (patch), subdermal, or IM route
4. Sterilization of a female participant's monogamous male partner prior to entry
into the study
5. Abstinence
6. For WOCBP, serum pregnancy test must be negative at screening; urine pregnancy test
must be negative within 24 hours before vaccination.
7. Lactating female participants must agree not to breastfeed or store breast milk for 3
days after each vaccination. A substituted formula is recommended during these
periods.
8. Negative serum antibodies (IgG) against SARS-CoV-2 N protein at screening except for
300 subjects in the seropositive cohort (Phase 3 only).
9. Negative result for RT-PCR screening of saliva or nasal mid-turbinate sample for
SARS-CoV-2 within 2 days before vaccination.
10. At high risk of SARS-CoV-2 exposure due to occupation (e.g., health care providers,
first responders, service industry workers, etc.), residence (multi-generational home,
long-term care facilities, etc.), or environment with high incidence (e.g., public
transportation), including geographic area.
11. Judged to be healthy or stable with pre-existing medical condition that did not
require significant change in medication or hospitalization in 3 months before
enrollment or who, in the judgement of the investigator are unlikely to require a
significant change in therapy or hospitalization for worsening disease in the 3 months
after enrollment.
12. Must be able to read, understand, and complete questionnaires in the electronic
clinical outcome assessment (eCOA) system.
13. Plans to reside within study area for the duration of the study.
14. Able to comply with study procedures, in the opinion of the investigator.
Exclusion Criteria:
1. Positive for SARS-CoV-2 shedding or self-reported history of prior infection with SARS
CoV-2.
2. Seropositive for SARS-CoV-2, except for 300 subjects in the seropositive cohort in
Phase 3 only.
3. Moderate or severe illness and/or fever >100.4°F/38°C within 1 week before
vaccination. Screening and/or study vaccination may be rescheduled at the discretion
of the investigator.
4. Canadian Frailty Scale score of ≥7 (see Appendix 1).
5. History of severe local or systemic reactions to any vaccination or a history of
severe allergic reactions.
6. Coronavirus vaccines: Previous receipt of SARS-CoV-2 vaccine or other investigational
coronavirus vaccine (SARS-CoV, MERS-CoV) at any time.
7. Investigational non-coronavirus vaccines: Previous receipt of an investigational
vaccine (non-coronavirus) within 1 year before the planned administration of the first
dose of study vaccine.
8. Licensed vaccines: Participant received or plans to receive: (a) licensed live
attenuated vaccines or licensed adjuvanted (non-aluminum compound) vaccine within 28
days before or after planned administration of study vaccine, and (b) other licensed
(not noted above) vaccines within 14 days before or after planned administration of
study vaccine.
9. Immunosuppressive or immunodeficient state, autoimmune diseases, chronic kidney
disease (with dialysis), asplenia, recurrent severe infections.
10. Individuals who receive treatment with immunosuppressive therapy, including cytotoxic
agents or systemic corticosteroids, e.g., for cancer or an autoimmune disease, or
planned receipt throughout the study.
11. Has received systemic immunosuppressants or immune-modifying drugs for >14 days in
total within 6 months prior to screening (for corticosteroids ≥20 mg/day of prednisone
equivalent).
12. Has received systemic immunoglobulins or blood products within 3 months prior to the
day of screening.
13. Has donated ≥450 mL of blood products within 28 days prior to screening.
14. Participant received an investigational drug (including investigational drugs for
prophylaxis of COVID-19) or used an invasive investigational medical device within 30
days. However, participants who received specific anti-SARS-CoV-2 monoclonal antibody
products (e.g., REGN-COV2) at any time are permanently excluded, even if such product
was given as part of a normal volunteer study.
15. Currently enrolled or plans to participate in another investigational study (drug,
vaccine, or device) during this study.
16. Pregnant.
17. Lactating women who are unwilling or unable to withhold breastfeeding and storing milk
for 3 days after each vaccination.
18. Bleeding disorder considered a contraindication to intramuscular injection or
phlebotomy.
19. Tattoos or scars at the deltoid sites of IM injection that would obscure injection
site reactions.
20. Behavioral, cognitive, or psychiatric disease that, in the opinion of the Principal
Investigator or his or her representative physician, affects the participant's ability
to understand and cooperate with all study protocol requirements.
21. Any alcohol or drug abuse over the 12 months prior to enrollment in the study that has
caused medical, professional or family problems, indicated by clinical history.
22. Any other condition that, in the opinion of the Principal Investigator or his/her
representative physician, could put the safety/rights of potential participants at
risk or prevent them from complying with the study protocol.
Gray Heppner, Study Chair
Chief Medical Officer