| Vaccine Platform |  Type of Vaccine 
and Immunogen |  Developer 
(Name of Vaccine) |  Dose Schedule 
and Administration |  Phase* |  Excipients† |  
 | RNA-based vaccine |  - mRNA encoding spike protein (30 μg)
 
  |  BioNTech–Pfizer 
(BNT162b2) |  - Two doses (day 0, day 21)
 - Intramuscular
 
  |  Post-EUA |  0.43 mg ((4-hydroxybutyl)azanediyl)bis(hexane-6,1-diyl)bis(2-hexyldecanoate), 0.05 mg 
2[(polyethylene glycol)-2000]-N,N-ditetradecylacetamide, 0.09 mg 1,2-distearoyl-sn-glycero-3-phosphocholine, and 0.2 mg cholesterol, 0.01 mg potassium chloride, 0.01 mg monobasic potassium phosphate, 0.36 mg sodium chloride, 0.07 mg dibasic sodium phosphate dihydrate, and 6 mg sucrose. The diluent (0.9% sodium chloride Injection) contributes an additional 2.16 mg sodium chloride per dose |  
 | RNA-based vaccine |  - mRNA encoding spike protein (100 μg)
 
  |  Moderna 
(mRNA-1273) |  - Two doses (day 0, day 28)
 - Intramuscular
 
  |  Post-EUA |  Lipids (SM-102; 1,2-dimyristoyl-rac-glycero-3-methoxypolyethylene glycol-2000 [PEG 2000-DMG]; cholesterol; and 1,2-distearoyl-sn-glycero-3-phosphocholine [DSPC]), tromethamine, tromethamine hydrochloride, acetic acid, sodium acetate, and sucrose |  
 Adenovirus vector 
(nonreplicating) |  - ChAdOx1-Sn Cov-19
 - Nonreplicating chimpanzee AdV5 expressing spike protein
 
  |  AstraZeneca and University of Oxford 
(AZD1222) |  - One (day 0) or two (day 0, day 28) doses
 - Intramuscular
 
  |  Phase 3 |  10 mM histidine, 7.5% (w/v) sucrose, 
35 mM sodium chloride, 1 mM magnesium 
chloride, 0.1% (w/v) polysorbate 80, 
0.1 mM edetate disodium, 0.5% (w/v) 
ethanol, at pH 6.6 |  
 Adenovirus vector 
(nonreplicating) |  - Ad26.COV2.S
 - Adenovirus 26 vectored vaccine using AdVac and PER.C6 technology
 
  |  Janssen |  - One (day 0) or two (day 0, day 56) doses
 - Intramuscular
 
  |  Phase 3 |  Sodium chloride, citric acid monohydrate, polysorbate 80, 2 hydroxypropyl-B-cyclodextrin (HBCD), ethanol (absolute), sodium hydroxide |  
 | Protein subunit |  - Full-length recombinant SARS-CoV-2 glycoprotein nanoparticle with Matrix M adjuvant
 - Spike prefusion protein
 
  |  Novavax |  - Two doses (day 0, day 21)
 - Intramuscular
 
  |  Phase 3 |  Matrix M1 adjuvant 
Full-length spike protein formulated in polysorbate 80 detergent and Matrix M1 adjuvant |  
 | Protein subunit |  - SARS-CoV-2 vaccine formulation with adjuvant (S-protein) (Baculovirus production)
 - Spike protein
 
  |  Sanofi Pasteur and GSK |  - Two doses (day 0, day 21)
 - Intramuscular
 
  |  Phase 1–2 |  Sodium phosphate monobasic monohydrate, sodium phosphate dibasic, sodium chloride polysorbate 20, disodium hydrogen phosphate, potassium dihydrogen phosphate, potassium chloride |  
 Phase information was current as of December 21, 2020. In all cases, the placebo was normal saline.   
† Bold entries are excipients potentially related to vaccine reaction that may be cross-reactive to other excipients (e.g., PEG 2000 and polysorbate 80). SM-102, a component of the Moderna vaccine, is a proprietary ionizable lipid. |