The #DeltaVariant of concern has increased transmissibility between people. It is important to keep practicing the preventive measures to help control... ... <看更多>

The #DeltaVariant is currently the predominant strain of the COVID-19 virus in the United States and is more than two times as contagious as previous... ... <看更多>

16:18 Now playing · Delta Variant Versus Previous COVID 19 Infection vs. Vaccines (Coronavirus Update 131) · 4:51 Now playing · CDC director talks Delta variant, ... ... <看更多>