What to know about the CDC's delta variant study and how it affects vaccinated Americans

The World Health Organization said COVID-19 infections are up 80% around the world in the last month, overwhelming health systems in many countries. In the U.S., the Centers for Disease Control and Prevention released a pivotal study showing fully vaccinated people can spread the delta variant as readily as non-vaccinated people. Amna Nawaz gets the details from Brown University's Dr. Ashish Jha.

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