NEW DELHI: Over 73.5 lakh samples have been tested for Covid-19 till June 23, of which 2.15 lakh were examined on Tuesday, the highest in a day since the beginning of the pandemic, ICMR officials said on Wednesday. The apex health research body validated the 1,000th testing laboratory, ramping up the capacity for detection of Covid-19 in the country. Currently, three lakh samples can be tested per day, an official said.