The surge in cases involving the "hypertransmissible" variant was not unexpected. Such infections had been predicted to double every few weeks.
On June 19, the delta variant accounted for just over 30 percent of new cases. On July 3, it crossed the 50 percent threshold to become the dominant variant in the U.S.
https://www.nbcnews.com/politics/white-house/u-s-won-t-lift-travel-restrictions-citing-spike-covid-n1275014
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