• Prior COVID-19 infection • Pregnant or breastfeeding women and women planning to become pregnant • Unwilling to use reliable contraception around the timing of the vaccine (one month before and one month after) • Receiving medication that might reduce immune responses. These include but are not limited to: - systemic corticosteroids - interleukins - interferons - cyclosporine - systemic chemotherapy

• Prior COVID-19 infection • Pregnant or breastfeeding women and women planning to become pregnant • Unwilling to use reliable contraception around the timing of the vaccine (one month before and one month after) • Receiving medication that might reduce immune responses. These include but are not limited to: - systemic corticosteroids - interleukins - interferons - cyclosporine - systemic chemotherapy