The United States on Monday implemented a ban on the entry of foreign travelers from eight countries in southern Africa amid growing concerns over a new variant of the coronavirus that was initially detected in South Africa. President Joe Biden asked the nation not to panic over the new Omicron variant, noting that existing COVID-19 vaccines are believed to provide “at least some protection” against it, while encouraging people to get vaccinated or receive a booster shot if fully vaccinated more than six months ago. “We do not yet believe that additional measures will be needed. But so that we…

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