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Herd Immunity: What, Why, and How?

When most of a population is immune to an infectious disease this provides protection to those who are not immune to the disease. Polio, measles, and mumps used to be very common, but are now relatively rare in most countries helped by vaccines and herd immunity.

Here we show how herd immunity works and why it’s important to help end the COVID-19 pandemic.

Learn more about how Rotary is combating COVID-19

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