Greece has introduced a seven-day quarantine for all passengers arriving from the United Kingdom as a preventive measure against the fast-spreading COVID-19 variant recently discovered in parts of the UK, the Greek Secretary General for Civil Protection said on Sunday."With regard to all arrivals from the United Kingdom, it is announced that starting from 6 a.m. [04:00 GMT] on Monday, December 21, the requirement of seven-day home isolation comes into force instead of the three-day [isolation] that applies to arrivals from every other country," the authority said in a statement.It added that all travelers were still required to have a negative polymerase chain reaction (PCR) test submitted no more than 72 hours before arrival.A number of.