New Delhi: 22 Dec 20 A new, more infectious strain of coronavirus detected in the United Kingdom, the Delhi government on Tuesday said it would trace all passengers who have arrived here from the country over the past 2 weeks, check them for COVID-19 symptoms, and test if needed.”Starting today, the Delhi government will conduct door-to-door survey of all those who have arrived in the city from the UK over the past two weeks,” Health Minister Satyendar Jain told NDTV on being asked about the government’s preparedness to check spread of the mutation in Delhi, where active cases have dropped to below the 10,000-mark after weeks of record infections and deaths amid a third wave of COVID-19.