1. Adults aged more than or equal to 18 years of either sex <br/ >2. Written informed consent by participants <br/ >3. Those who have completed primary COVID-19 vaccination schedule with at least 6 months ago <br/ >4. Female participants of childbearing potential must have a negative urine pregnancy test within 24 hours prior to study vaccine administration

1. Adults aged more than or equal to 18 years of either sex <br/ >2. Written informed consent by participants <br/ >3. Those who have completed primary COVID-19 vaccination schedule with at least 6 months ago <br/ >4. Female participants of childbearing potential must have a negative urine pregnancy test within 24 hours prior to study vaccine administration