A person in California who had been vaccinated against COVID-19 became the first in the US to have an identified case of the omicron variant, the White House announced as scientists continue to study the risks posed by the new virus strain.Dr Anthony Fauci told reporters that the person was a traveller who returned from South Africa on November 22 and tested positive on November 29.Dr Fauci said the person was vaccinated but had not received a booster shot and was experiencing "mild symptoms".
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