As more people become vaccinated, we hope to reach herd immunity, meaning that the percentage of people with immunity is sufficient to prevent an outbreak (increasing growth of the number of infected people). Immunity induced by vaccination or by infection combine to give the overall percentage of immunity. We do not know yet how long either immunity persists.

Reaching herd immunity is important to protect the small number of people with medical problems which preclude vaccination. Herd immunity does not mean a non-immune person cannot become ill from exposure to an infected person, but it means the non-immune person will be less likely to get infected since they will interact with fewer infected people.

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