How do vaccines offer protection against COVID-19? WebMD Chief Medical Officer Dr. John Whyte explains.Subscribe to WebMD:Follow WebMD: Website: Facebook: Pinterest: Twitter: Instagram: Coronaviruscoronavirus immunitycovidcovid vaccineCOVID-19COVID19herd immunityimmune systemIMMUNITYOfferProtectionVaccinevaccinesvideoVITAMINvlogVocabularyWebMDYouTube
