Assam on Wednesday reported an over 53 per cent fall in daily Covid-19 cases compared to the previous day, as 1,951 more people tested positive for the virus, according to the official data. The positivity rate, however, increased to 9.85 per cent with testing of only 19,803 samples during the day from 9.61 per cent on Tuesday when 43,587 samples were tested, the National Health Mission (NHM) said.