MUMBAI : In view of the emergence of a new coronavirus variant in the UK, the Mumbai civic body on Sunday issued revised guidelines to ensure the compulsory quarantine for 14 days for all passengers arriving from the UK, Europe, and the Middle East.As per the amended Standard Operating Procedures (SOP), travellers will be kept under institutional quarantine after arrival and RT-PCR test will be conducted on the seventh day from the arrival at the respective hotels, institutional facilities at their own coast."If the report of the test is found negative, the passenger would be discharged from the institutional quarantine after seven days with the advice of seven days mandatory home quarantine.