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 Did Your Allergies Get Worse After COVID? Watch This February 26, 2026 There may be a universal vaccine in the future. #science #vaccine #doctor February 21, 2026 The Immune Shift No One Explains After COVID February 19, 2026 Doctor Reacts: Covid masks in 2026?! February 19, 2026 ‘Particularly capricious’: Doctor weighs in on undermining of mRNA technology February 15, 2026 COVID’s Hidden Impact: Immune System Triggers Explained #shorts January 30, 2026