New mask guidance in US

With the more contagious Delta variant, some officials are issuing new mask guidance

Delta variant has spread to almost every state in the US, The variant is expected to become the dominant coronavirus strain in the US, the director of the Centers for Disease Control and Prevention said. And with half the US still not fully vaccinated, doctors say it could cause a resurgence of Covid-19 in the fall.

In Los Angeles County, the pace of Delta's spread has prompted officials to reinstate mask guidance for public indoor spaces -- regardless of vaccination status.

The Pfizer/BioNTech vaccine has shown to be 88% effective against symptomatic infections caused by the Delta variant -- two weeks after the second dose. Those who received only one dose have significantly less protection.

And Moderna's vaccine was found in lab experiments to work against new variants such as the Delta strain, the company said Tuesday.

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