1. Adult male or female volunteers aged 18-65 years (inclusive of both) who are not vaccinated for COVID-19/Influenza and willing to give written, signed and dated informed consent to participate in the study <br/ >2. Negative immunoglobulin M (IgM) SARS-CoV-2 antibodies through enzyme immunoassay test result <br/ >3. Negative COVID-19 Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) test result at the screening visit <br/ >4. No acute infections and/or respiratory diseases within 14 days before enrollment <br/ >5. Negative human immunodeficiency virus (HIV 1 & 2), Syphilis, Hepatitis B and C test results

1. Adult male or female volunteers aged 18-65 years (inclusive of both) who are not vaccinated for COVID-19/Influenza and willing to give written, signed and dated informed consent to participate in the study <br/ >2. Negative immunoglobulin M (IgM) SARS-CoV-2 antibodies through enzyme immunoassay test result <br/ >3. Negative COVID-19 Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) test result at the screening visit <br/ >4. No acute infections and/or respiratory diseases within 14 days before enrollment <br/ >5. Negative human immunodeficiency virus (HIV 1 & 2), Syphilis, Hepatitis B and C test results

1. Adult male or female volunteers aged 18-65 years (inclusive of both) who are not vaccinated for COVID-19/Influenza and willing to give written, signed and dated informed consent to participate in the study <br/ >2. Negative immunoglobulin M (IgM) SARS-CoV-2 antibodies through enzyme immunoassay test result <br/ >3. Negative COVID-19 Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) test result at the screening visit <br/ >4. No acute infections and/or respiratory diseases within 14 days before enrollment <br/ >5. Negative human immunodeficiency virus (HIV 1 & 2), Syphilis, Hepatitis B and C test results

1. Adult male or female volunteers aged 18-65 years (inclusive of both) who are not vaccinated for COVID-19/Influenza and willing to give written, signed and dated informed consent to participate in the study <br/ >2. Negative immunoglobulin M (IgM) SARS-CoV-2 antibodies through enzyme immunoassay test result <br/ >3. Negative COVID-19 Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) test result at the screening visit <br/ >4. No acute infections and/or respiratory diseases within 14 days before enrollment <br/ >5. Negative human immunodeficiency virus (HIV 1 & 2), Syphilis, Hepatitis B and C test results