Ask the Experts: What Is Herd Immunity?

February 5, 2022

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Q. Throughout the pandemic, I’ve heard the term herd immunity bounced around. What exactly is that? Herd immunity occurs when enough individuals in a community have acquired immunity against a particular infection to make person-to-person transmission less likely. An individual’s immunity can be acquired by either getting vaccinated against the infection or contracting the infection. […]
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