A person in California became the first in the US to have an identified case of the Covid-19 Omicron variant, the White House announced on Wednesday as scientists continue to study the risks posed by the new strain of the virus.The Biden administration moved late last month to restrict travel from southern Africa where the variant was first identified and had been widespread. Clusters of cases have also been identified in about two dozen other nations.“This is the first case of Covid-19 caused…

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