COVID-19 surge is now helping to create herd immunity

As coronavirus cases plummet nationwide and vaccinations total 1.7 million Americans a day and rising, health experts are increasingly striking a new tone in their pandemic assessments: optimism.

“I could be wrong, but I don’t think we’re going to see a big fourth surge,” said Dr. Paul Offit, a vaccine expert at Children’s Hospital of Philadelphia. “I think we’ve seen the worst of it.”

Many epidemiologists and other scientists, while still cautious, say they feel …

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