India scaled a new high on Thursday by testing over 8.3 lakh samples in last 24 hours, the highest tested for Covid-19 in a day so far, even as new cases continued to increase registering a record single-day surge of 66,999 cases.India scaled a new high on Thursday by testing over 8.3 lakh samples in last 24 hours, the highest tested for Covid-19 in a day so far, even as new cases continued to increase registering a record single-day surge of 66,999 cases.