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Half of Europe will have been infected with the Omicron variant of Covid-19 within six to eight weeks, the World Health Organization has warned. As Omicron becomes the dominant variant across the globe, some BBC World News viewers have been sending in questions. Would it be accurate to say Omicron is like a bad flu? Have countries started changing their travel restrictions? Can having a cold over winter protect you against Covid? BBC World News’s Lucy Hockings put these questions and others to Prof David Montefiori, immunologist at Duke University, and Julia Lo Bue-Said the CEO at The Advantage Travel Partnership.