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> Aren't the people you care about vaccinated?

It is not that easy. Some people cannot be vaccinated, for example measles vaccination isn't licensed for babies younger than 6 months AFAIK. So they will still be at risk from others who could have gotten vaccinated but didn't.

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That's a bit of an edge case.

A major benefit of herd immunity is to help with the edge cases - people who cannot, or should not, be vaccinated, but would be in danger from these infections should they be exposed.

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