You are using an older browser version. Please use a supported version for the best MSN experience.

CDC Chief on Omicron, Delta killing unvaccinated and why mask rules changed

As the Omicron variant spreads across the U.S., CDC Director Dr. Rochelle Walensky joins MSNBC's Ari Melber to discuss what experts know about the new variant, why the Delta variant is still the main coronavirus risk in the U.S. and the CDC's shifting mask guidance.
image beaconimage beaconimage beacon