Experimental: Arm 1 25 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 18-55 years of age. N=15 (4 sentinel, 11 non-sentinel) Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 10 50 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 18-55 years of age. N=15. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 11 50 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 56-70 years of age. N=10. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 12 50 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants 71 years of age or older. N=10. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 13 10 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 18-55 years of age. N=15. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 2 100 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 18-55 years of age. N=15 (4 sentinel, 11 non-sentinel). Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 3 250 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 18-55 years of age. N=15 (4 sentinel, 11 non-sentinel). Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 4 25 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 56-70 years of age. N=10. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 5 100 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 56-70 years of age. N=10. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 6 250 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants from 56-70 years of age. N=10. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 7 25 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants 71 years of age or older. N=10. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.



Experimental: Arm 8 100 mcg of mRNA-1273 administered through 0.5 mL intramuscular injection in the deltoid muscle on Days 1 and 29 in participants 71 years of age or older. N=10. Biological: mRNA-1273 Lipid nanoparticle (LNP) dispersion containing an mRNA that encodes for the prefusion stabilized spike protein 2019-nCoV. mRNA-1273 consists of an mRNA Drug Substance that is manufactured into LNPs composed of the proprietary ionizable lipid, SM-102, and 3 commercially available lipids, cholesterol, DSPC, and PEG2000 DMG.

