On November 25, India called for strict tracking and testing of people flying from Botswana, South Africa & Hong Kong. A new variant of Covid-19 has been found at these places with multiple mutations. It has led to a surge in cases. Union Health Secretary Rajesh Bhushan has written a letter to the states and union territories, asking them to conduct strict screening and testing. It has been found in South Africa and other places. On November 25, authorities confirmed 22 positive cases associated with it. Dr Tom Peacock, a virologist at Imperial College London, shared details of the new variant classed as B.1.1.529 on his Twitter account. Watch the video to know more.