As we get closer to a COVID vaccine rollout, you may be wondering how such a vaccine will work. WebMD Chief Medical Officer Dr. John Whyte explains.Subscribe to WebMD:Follow WebMD: Website: Facebook: Pinterest: Twitter: Instagram: Coronaviruscovidcovid vaccineCOVID-19COVID-19 immunityCOVID19immune systemIMMUNITYpublic healthVaccinevideoVITAMINvlogVocabularyYouTubeRelated Posts COVID’s New Variant Is Spreading Faster Than Expected April 16, 2026 These Aren’t Just Hormone Problems April 16, 2026 New COVID Variant ‘Cicada’ Spreading Across U.S. | Seniors at Highest Risk April 15, 2026 Persistent immune activation and MS explosion #diseaseprevention April 13, 2026 Cicada COVID Variant Spreading in U.S. | What Doctors Want You to Know Now April 12, 2026 New COVID Variant Affecting Kids April 7, 2026