Why blanket travel bans won’t work to stop omicron

Why blanket travel bans won’t work to stop omicron
Countries are slamming their borders shut again. Since the omicron variant was discovered in southern Africa and reported to the World Health Organization last week, more than 50 countries have imposed border controls. They target mostly South Africa and Botswana, which reported the first cases, but also neighboring countries in the region. …
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