Dr. Jen Ashton shares the data on efficacy, possible side effects and more. ashtonCoronavirusCOVID-19COVID-19 immune systemCOVID19dr.Effectshealthimmune systemIMMUNITYJenp_cmsid=2494279p_vid=news-74633150pandemicPfizerSafeSideVaccinevideoVIRUSVITAMINvlogYouTube