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Shortly after, Moderna emerged onto the scene, which is another two-dose vaccine 'developed by Moderna with assistance from the National Institute of Allergy and Infectious Diseases.'
Unlike Pfizer and Moderna, the Johnson & Johnson's vaccine, which was developed by the company's vaccine division Janssen Pharmaceuticals, is a one-dose vaccine and is considered a 'viral vectored vaccine' because it 'instructs human cells to make the SARS-2 spike protein, which then triggers an immune response.'
Choose your fighter: Despite being ecstatic about his vaccination status, the late night host did not reveal if he received the Moderna, Pfizer, or Johnson & Johnson vaccine in his post