1. Adult male or female human volunteer aged 18-65 years (inclusive of both) and not vaccinated for COVID-19/influenza, willing and able to provide written, signed and dated informed consent 2. Negative immunoglobulin M (IgM) SARS-CoV-2 antibodies through enzyme immunoassay test result 3. Negative COVID-2019 Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) test result at the screening visit 4. No medical history or evidence of COVID-19 5. No acute infections and/or respiratory diseases within 14 days before enrollment 6. No evidence of vaccine-induced reactions or complications after receiving immunobiological products in the past medical history 7. Willing to give consent to use effective contraception methods during the study 8. Negative urine pregnancy test at the screening visit (for childbearing aged women) 9. Negative human immunodeficiency virus (HIV 1 & 2), syphilis, hepatitis B and C test results

1. Adult male or female human volunteer aged 18-65 years (inclusive of both) and not vaccinated for COVID-19/influenza, willing and able to provide written, signed and dated informed consent 2. Negative immunoglobulin M (IgM) SARS-CoV-2 antibodies through enzyme immunoassay test result 3. Negative COVID-2019 Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) test result at the screening visit 4. No medical history or evidence of COVID-19 5. No acute infections and/or respiratory diseases within 14 days before enrollment 6. No evidence of vaccine-induced reactions or complications after receiving immunobiological products in the past medical history 7. Willing to give consent to use effective contraception methods during the study 8. Negative urine pregnancy test at the screening visit (for childbearing aged women) 9. Negative human immunodeficiency virus (HIV 1 & 2), syphilis, hepatitis B and C test results