The Safety and Immunogenicity of a DNA-based Vaccine (COVIGEN) in Healthy Volunteers

INCLUSION CRITERIA

Potential participants must fulfil all of the following inclusion criteria to be eligible
to participate in the study:

1. Willing and capable of providing written informed consent prior to the performance of
any study-specific procedure.

2. Male or female, ≥18.0 to ≤75. years of age, at the time of consent.

3. The participant must be in good health, as established by pertinent medical history,
physical examination and vital signs assessments performed at Screening.

4. Body mass index (BMI) of 18 to 40 kg/m2, inclusive, at Screening.

5. Women of childbearing potential must have a negative urine pregnancy test at Screening
and pre-dose on Day 1, and must agree to remain sexually abstinent, use medically
effective contraception (see Section 4.3.10), or have a partner who is sterile or
same-sex, from Screening until at least 90 days after the 2nd vaccination (Part A) or
the Booster (Part B).

a. Females with natural amenorrhea for <2 years (without an alternative medical cause)
and who are not surgically sterile, i.e. tubal ligation, bilateral oophorectomy, or
complete hysterectomy will only be considered not to be of childbearing potential if
they have a documented follicle-stimulating hormone (FSH) value in the postmenopausal
range.

6. Sexually active male participants who are considered sexually fertile must agree to
use either a barrier method of contraception from the time of 1st vaccination until at
least 90 days after the 2nd vaccination (Part A) or the Booster (Part B), or have a
same sex partner, or have a partner who is permanently sterile or unable to become
pregnant;

7. Both male and female participants must agree to refrain from sperm and egg donation
from the day of the 1st vaccination until at least 90 days after the 2nd vaccination
(Part A) or the Booster (Part B)..

8. Clinical safety laboratory evaluations at Screening must be toxicity Grade 0 or 1, or
deemed not clinically significant by the Investigator.

9. The participant must agree to refrain from donating blood or plasma during the study
for non-study purposes.

10. The participant must agree to have study samples retained for secondary research
including exploratory analyses.

11. The participant must be able to attend all scheduled visits and to understand and
comply with planned study procedures, in the Investigator's judgement.

12. Part B only: The participant must have completed a primary course (2 doses) of either
Comirnaty (Pfizer BioNTech) or Astra Zeneca vaccine and ≥3 months (≥90 days) has
elapsed since receipt of dose 2 in the primary course.

EXCLUSION CRITERIA

If any of the following exclusion criteria apply, the potential participant will not be
permitted to participate in the study:

1. Female participant who is breastfeeding or intends to become pregnant from Screening
until at least 90 days after the 2nd vaccination (Part A) or at least 90 days after
booster vaccination (Part B).

2. History of any major (per Investigator's discretion) cardiovascular, renal,
neurological, metabolic, gastrointestinal, hepato-biliary, uncontrolled hypertension
and diabetes, clinically significant chronic pulmonary disease, asthma (with the
exception of history of resolved childhood asthma), immunological and autoimmune
diseases or any condition which, in the opinion of the Investigator, might interfere
with the evaluation of the study objectives.

3. Chronic use (more than 14 continuous days) of systemic corticosteroids within 30 days
prior to Screening. Intra-articular, intra-bursal, or topical (skin or eyes)
corticosteroids are permitted.

4. History of any haematological malignancy or active neoplastic disease (excluding
non-melanoma skin cancer that was successfully treated). Active is defined as having
received treatment within the past 5 years.

5. History of demyelinating disease or Guillain Barre syndrome.

6. Eczema or other significant skin lesion, infection or tattoo at the site of
vaccination (left or right upper arm).

7. History of blood dyscrasia or significant disorder of coagulation that, in the opinion
of the Investigator, contraindicates IM injection (Part A only).

8. History of known or suspected hypersensitivity or any severe allergic reaction
including anaphylaxis, generalised urticaria, angioedema, and other significant
reaction to Kanamycin or any vaccine component,.

9. Presence of active viral or bacterial infection, with or without fever (oral
temperature ≥37.8 °C) at Screening or within 72 hours prior to each vaccination, if
determined by the Investigator to be of clinical significance (enrolment [provided
Screening period does not exceed 30 days] or dosing may be delayed for full recovery
if acceptable to the Investigator).

10. Positive serological test for Hepatitis B surface antigen (HBsAg), Hepatitis C
antibody or HIV (Type 1 or 2) antibody at Screening.

11. Known current or previous laboratory confirmed SARS-CoV-2 infection/COVID 19, or
positive for SARS-CoV-2 infection, either by SARS CoV 2-specific IgG antibody (Part A
only) or RT-PCR, at Screening.

12. Suspected SARS-CoV-2 infection/COVID-19, including individuals who are required to
self-isolate.

13. Individuals currently working in occupations with high risk of exposure to SARS CoV-2,
e.g. healthcare workers in direct care of COVID-19 patients, emergency responders or
front-line workers.

14. Receipt of any other SARS-CoV-2 or other experimental coronavirus vaccine at any time
prior to the study or planned receipt of any other SARS-CoV-2 or other experimental
vaccine within 57 days of receipt of the 1st study vaccination (Part A only).

15. Receipt of any other experimental coronavirus vaccine at any time prior to the study
or planned receipt of any other SARS-CoV-2 or other experimental vaccine within 29
days of receipt of the booster vaccination (Part B only).

16. Participating in any other clinical study and have received any other investigational
product (i.e. study vaccine, drug, biologic or device) within 30 days or 5 half-lives
(whichever is longer) prior to Screening, or are taking part in a non medication study
which, in the opinion of the Investigator, would interfere with the interpretation of
the assessments in this study.

17. Received or plans to receive a live-attenuated vaccine within 4 weeks before or after
each study vaccination.

18. Received or plans to receive an inactivated vaccine within 2 weeks before or after
each study vaccination (including influenza vaccines).

19. Received immunoglobulins and/or any blood or blood products within 3 months before the
1st vaccination (Part A) or before the booster vaccination (Part B) or plans to
receive any blood or blood products at any time during the study.

20. Has a history of alcohol abuse, or other drug abuse assessed as a dependency problem
by the Investigator within 6 months before the 1st vaccination (Part A) or before the
booster vaccination (Part B).

21. Has any psychiatric or cognitive disease that, in the opinion of the Investigator, may
interfere with the participant's ability to participate in the study.