The number of deaths due to COVID-19 has topped 3 million worldwide, according to a tally from Johns Hopkins University. More than 566,000 of those deaths have been in the United States, which is now seeing a rise in coronavirus cases despite efforts to get people vaccinated.

About 40% of Americans have received at least one dose of the COVID vaccine, and nearly a quarter of those are fully vaccinated.

But as Tom Hanson reports for "CBS This Morning: Saturday," new variants of the virus are fueling the latest surge in cases.

"The good news is vaccine rollout is moving along at a great pace," said Dr. David Ho of Columbia University. "The bad news is that the variants are emerging everywhere."

Ho has his eye on yet another variant, identified in his Columbia University lab in New York City.

"It's concerning because it's spreading at a rate that is on par with the U.K. variant and we know the U.K. variant is more transmissible and more lethal," he said.

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