- already has received pfizer, moderna or johnson & johnson vaccine - known diagnosis of covid-19 prior to screening - has a contraindication to receiving an mrna covid-19 vaccine - has an immediate allergic reaction to past vaccine or injection - any major episode of infection requiring hospitalization or treatment with intravenous antibiotics within 2 weeks prior to the screening visit

- already has received pfizer, moderna or johnson & johnson vaccine - known diagnosis of covid-19 prior to screening - has a contraindication to receiving an mrna covid-19 vaccine - has an immediate allergic reaction to past vaccine or injection - any major episode of infection requiring hospitalization or treatment with intravenous antibiotics within 2 weeks prior to the screening visit