ZURICH (Reuters) – The first probable case of the Omicron variant of COVID-19 has been detected in Switzerland, the government said late on Sunday, as the country tightened its entry restrictions to check its spread. The case relates to a person who returned to Switzerland from South Africa around a week ago, the Federal Office for Public Health said on Twitter. Testing will clarify the situation in the coming days, it added. Switzerland has ordered that travellers from 19 countries must present a negative test when boarding a fight to the country, and must go into quarantine for 10 days on ar…

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