Clinical Trial For SARS-CoV-2 Vaccine (COVID-19)

Inclusion Criteria:

- 18-59 years of age (including 18 and 59 years of ages),

- For only K1 cohort, health care workers such as medical doctor, nurse, ward boy,
cleaner, hospital technician, administrative personnel who work in any department of a
hospital.

- Signed informed consent

Exclusion Criteria:

- Previously PCR positive for COVID-19

- IgG or IgM is positive

- For females: Pregnancy (confirmed by positive beta-hCG test), breastfeeding or intent
to engage in sexual relations with reproductive intent without use of birth control
methods in the three months following vaccination

- Known allergy to components of the study vaccine or control

- Use of immunosuppressant therapy regimens within the six months prior to enrollment in
the study or planned use within the two years following enrollment. Immunosuppressant
therapy regimens include: antineoplastic chemotherapy, radiation therapy and
immunosuppressants to induce transplant tolerance, among others

- Use of immunosuppressive doses of corticosteroids within the three months prior to the
enrollment in the study and planned use of immunosuppressive doses of corticoids
within the three months following enrollment in the study. Immunosuppressive doses of
corticosteroids will be considered the equivalent prednisone 20 mg/day for adults, for
longer than one week. Continued use of topical or nasal corticosteroids is not
considered an immunosuppressant

- History of asplenia

- History of bleeding disorder (e.g. factor deficiency, coagulopathy or platelet
disorder), or prior history of significant bleeding or bruising following IM
injections or venipuncture

- 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

- Administration of immunoglobulins and/or any blood products within the three months
preceding the planned administration of the vaccine candidate

- Participation in another clinical trial with an investigational product in the six
months prior to enrollment in the study or planned participation in another clinical
trial within the two years following enrollment

- Received live attenuated virus vaccine 14 days prior to enrollment in the study

- Inactivated vaccine or sub unit vaccine 7 days prior to enrollment in the study

- Fever (oral temperature >37.2℃, axillary temperature will not be accepted) within the
past 24 hours

- 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 this protocol.

- Any confirmed or suspected autoimmune disease or immunodeficiency disease, including
human immunodeficiency virus (HIV) infection.