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What is herd immunity and will it affect the pandemic?
A volunteer attaches an elastic band while assembling face shields as she and other volunteers meet an urgent need of local hospitals for personal Covid-19 protective equipment in Renton, Washington March 19, 2020. u00e2u20acu201d Reuters pic

LONDON, March 20 — The outbreak of disease caused by the new coronavirus has raised questions about a phenomenon known as "herd immunity" and whether it might play a role in how the pandemic progresses.

Here are some insights from infectious disease specialists:

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What is herd immunity?

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