Inclusion Criteria:  Provide written informed consent prior to initiation of any study procedures. No history of previous Covid-19 vaccinations Women of childbearing potential must use an acceptable contraception method from at least 28 days before study vaccination until 14 days after last study vaccination. Understand and comply with planned study procedures and be available for all study visits.  Exclusion Criteria:  Have a history of severe systemic reactions (anaphylaxis, breathing difficulties, severe rash) following previous immunization with licensed or unlicensed vaccines. Have a history of abnormal blood clotting or thrombocytopenia Received an experimental agent within 30 days prior to the study vaccination or expect to receive another experimental agent during the trial-reporting period. Intend to receive another Covid-19 vaccine during the time of the study