The national task force on COVID-19 held a meeting on Saturday over the new mutant strain of the coronavirus that was first traced in the UK and discussed surveillance strategies to detect and contain the highly contagious infection. More than 50 samples of people who have returned from the UK are currently being sequenced at six labs across the country to find out if they have the mutant strain and district surveillance officers are identifying passengers who have arrived from the country in the last one month, officials said.