CDC Reverses Indoor Mask Policy For Vaccinated Americans

For weeks the CDC said vaccinated people don't need to wear masks, but updated guidance is saying vaccinated people should wear masks in areas with low vaccination rates. Associate professor of emergency medicine and public health at Brown University Dr. Megan Ranney, explains what can be done to slow the delta variant before students are back in the classroom.  » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews

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