Newsom will discuss it along with other safety measures at a testing clinic in Alameda County on Wednesday.
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The ruling comes as the new COVID-19 Omicron variant is the dominant variant of cases. Federal health officials said the variant accounted for 73% of new cases last week.
Scientists in Africa first sounded the alarm about omicron less than a month ago and on Nov. 26 the World Health Organization designated it as a "variant of concern." The mutant has since shown up in about 90 countries.
RELATED: Omicron variant sweeps across nation, now 73% of US COVID-19 cases
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California has given more than 64 million doses of the COVID-19 vaccine.