You’ve heard people talk about “herd immunity.” So, what it is? And does the same rule apply amid the COVID-19 pandemic? Mercy’s Nathaniel Barbe, MD, answers that question. For more resources, visit Mercy.net/COVID19. Coronaviruscoronavirus immunityCOVID-19COVID19fluHerdimmune systemIMMUNITYSeasonvideoVITAMINvlogYouTubeRelated 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