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Sacramento County is now recommending all residents wear masks in public indoor areas, regardless of their vaccination status.

The move is meant to protect neighborhoods where COVID-19 vaccination rates are lower than the rest, particularly Rio Linda, North Highlands and Citrus Heights.

Los Angeles County has gone one step further, requiring masks indoors, beginning Saturday.

This comes as the surge of the more infectious delta variant is hitting nearly every region of the U.S.

So how concerned should we be, and how will this impact vaccinated versus unvaccinated groups?

Dr. Michael Vollmer, an infectious disease expert with Kaiser Permanente Vacaville, joined Richard to discuss the delta variant.