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What is herd immunity? - Keeping healthy: Video playlist - BBC Bitesize
Sophie Ward explains how herd immunity can protect populations against infectious disease.
↗ https://www.bbc.co.uk/bitesize/topics/zgmmdnb/watch/zs8bnk7Sophie Ward explains how herd immunity can protect populations against infectious disease.
↗ https://www.bbc.co.uk/bitesize/topics/zgmmdnb/watch/zs8bnk7