1. Healthy male or female between the ages of 18 and 69 years 2. SARS-CoV-2 seropositive subjects aged 18 to 69 years, inclusive (including subjects who received a COVID-19 vaccine 3-6 months prior to booster and excluding subjects with a history of prior COVID-19 infection) 3. Documented SARS-CoV-2 antibody test result prior to Day 0 vaccination (documentation of prior licensed or provisionally approved SARS-CoV-2 vaccination is required) 4. Body mass index (BMI) 17 to 35 kg/m2, inclusive, at screening

1. Healthy male or female between the ages of 18 and 69 years 2. SARS-CoV-2 seropositive subjects aged 18 to 69 years, inclusive (including subjects who received a COVID-19 vaccine 3-6 months prior to booster and excluding subjects with a history of prior COVID-19 infection) 3. Documented SARS-CoV-2 antibody test result prior to Day 0 vaccination (documentation of prior licensed or provisionally approved SARS-CoV-2 vaccination is required) 4. Body mass index (BMI) 17 to 35 kg/m2, inclusive, at screening

1. Healthy male or female between the ages of 18 and 69 years 2. SARS-CoV-2 seropositive subjects aged 18 to 69 years, inclusive. 3. Documented SARS-CoV-2 antibody test result prior to Day 0 vaccination (documentation of prior licensed or provisionally approved SARS-CoV-2 vaccination is required) 4. Body mass index (BMI) 17 to 35 kg/m2, inclusive, at screening.

1. Healthy male or female between the ages of 18 and 69 years 2. SARS-CoV-2 seropositive subjects aged 18 to 69 years, inclusive. 3. Documented SARS-CoV-2 antibody test result prior to Day 0 vaccination (documentation of prior licensed or provisionally approved SARS-CoV-2 vaccination is required) 4. Body mass index (BMI) 17 to 35 kg/m2, inclusive, at screening.