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Why do we need multiple doses of a vaccine?

After infection or vaccination, our immune system starts to form a memory of how to fight a germ and protect us against future disease. But why do we need more than one dose of a vaccine, and why is a gap between doses important? This video was produced by Cloud Chamber Studios for the British Society for Immunology, and narrated by Professor Donald J. Davidson at the University of Edinburgh. Our 'Immune Memory & the Coronavirus' is a three-part video series explaining the detail of how your immune system remembers germs it has seen before, watch them all at http://www.immunology.org/coronavirus...