Bbc News
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Immunisation: Why we do it and how 'herd immunity' works - BBC News
Posted
June 19, 2019
Views
27,680
Likes
281
Comments
134
Engagement
1.50%
June 19, 2019
27,680
281
134
1.50%
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2:21Now PlayingThis is how vaccines work, why they’re important and what the phrase “herd immunity” actually means.
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