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Herd immunity could protect us from COVID-19 — in theory. Infectious disease experts explain.

The scientific concept explains that a virus will die out after a high percentage of a population is infected — and survives the disease, developing immunity.

FILE - In this Friday June 19, 2020 file photo people picnic during the annual Midsummer celebrations in Stockholm, Sweden. Sweden's "herd immunity" low-key approach to coronavirus lockdowns captured the world's attention when the pandemic first hit Europe.
FILE - In this Friday June 19, 2020 file photo people picnic during the annual Midsummer celebrations in Stockholm, Sweden. Sweden's "herd immunity" low-key approach to coronavirus lockdowns captured the world's attention when the pandemic first hit Europe.Read moreAndres Kudacki / AP
    by Bethany Ao
    Published