More than 664,000 Americans have died from COVID-19 while over 4.6 million people have died from the disease worldwide, according to real-time data compiled by the Center for Systems Science and Engineering at Johns Hopkins University.

Just 63.2% of Americans ages 12 and up are fully vaccinated against COVID-19, according to data from the Centers for Disease Control and Prevention.

Talk show host Wendy Williams has a breakthrough COVID-19 case, her show said.

Pfizer said the vaccine's protection against infection is waning over time.

Pfizer also heavily leaned on data from Israel to show that the vaccine's protection against severe COVID-19 could start to erode in the U.S.