The US has identified its first reported case of Covid-19 caused by the Omicron variant, with health officials confirming that an individual in California had tested positive.
The Centers for Disease Control and Prevention said on Wednesday that the variant was discovered in an individual who returned from South Africa on November 22, two days before the variant was first reported to the World Health Organization by the country.
Anthony Fauci, the chief medical adviser to President Joe Biden, said the individual was fully vaccinated and displayed mild symptoms.
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