Maharashtra reported a jump of 5,427 cases on Thursday and Mumbai reported 736 cases. The city's civic body has announced new rules for the city. Amravati and Yavatmal have also been placed under restrictions. The positivity rate in Amravati is surging at 53 per cent and experts have told NDTV that a new, more transmissible Covid mutation, E484K, has been detected and that this could be inborn. Here's everything we know about the 'Indian strain'.