Tamil Nadu on Wednesday added 3,971 new Covid-19 infections, pushing the caseload to 34,24,476 while 28 more fatalities took the death toll to 37,837, the health department said. Recoveries eclipsed new cases with 16,473 people getting discharged in the last 24 hours, aggregating to 33,09,032 leaving 77,607 active infections, a medical bulletin said.