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Are we at the beginning of the end of COVID-19? The tricky road to herd immunity, explained.

As many as 1 in 5 Americans may have been infected with the coronavirus, and millions more have been vaccinated. But scientists say a return to normal is months away.

The United States has more than 21 million confirmed cases of COVID-19 — a rate approaching one in 15 people — plus untold millions who had mild or no symptoms and were never identified.
The United States has more than 21 million confirmed cases of COVID-19 — a rate approaching one in 15 people — plus untold millions who had mild or no symptoms and were never identified.Read moreGetty Images
    by Tom Avril
    Published