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並前往https://www.usatoday.com/story/news/health/2021/04/19/herd-immunity-us-likely-impossible-but-vaccines-can-control-covid/7139419002/

Is herd immunity to COVID-19 possible? Experts ... - USA Today

The United States may never reach full herd immunity against COVID-19 experts say, but vaccination can tame the coronavirus.

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