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Herd immunity and COVID-19: What you need to know

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Herd immunity is the name for a point in time when it's hard for a disease to spread through a group of people. The idea of herd immunity works for some diseases, such as measles. But it's a harder concept to apply to illnesses like coronavirus disease 2019 (COVID-19).

Read on to learn how herd immunity makes sense for some diseases but not others.