A new coronavirus variant has upended travel plans with countries racing to impose border curbs to keep out the new strain, despite the World Health Organization denouncing blanket bans on entry.Omicron (often pronounced “oh-me-cron” or “ah-me-cron”), or the B.1.1.529 variant, was first reported to the WHO by South Africa on November 24.The WHO has estimated it has 26 to 32 mutations in the spike protein, the part of the virus that attaches to human cells. This is three to four times the eight…
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