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Named Omicron, the new variant of COVID-19 originates in south Africa and raises concerns about vaccine resistance as well as natural immunity gained from overcoming the disease. - Nový variant COVID-19, ktorý dostal meno Omicron, má pôvod v južnej Afrike a vyvoláva obavy z odolnosti voči vakcínam, ako aj prirodzenej imunite získanej prekonaním ochorenia.