The Immune System Explained I – Bacteria Infection Channel: Kurzgesagt – In a Nutshell54.0M views • 06/06/2015Related VideosHow The Immune System ACTUALLY Works – IMMUNEWhat Is the Immune System for Kids | Learn all about how the body fights off bad germsHow does your immune system work? - Emma BryceAntibiotics, Antivirals, and Vaccines