Chennai: With Tamilnadu reporting less than 5,000 cases for the past two days, the Health department will commence a State-wide serosurveillance study on Covid-19 exposure in a week.
Serosurveillance study is conducted to ascertain the antibody levels produced against the infection by testing blood (serum or plasma) samples.
According to Tamilnadu Health Secretary Dr J Radhakrishnan, in the first phase, of the 60,000 blood samples to be collected from all the districts, nearly 30,000 would be tested for the antibodies.
Tamilnadu on Tuesday reported 4,666 new Covid-19 cases, taking the tally to 6,65,930 and 57 more fatalities pushed the toll to 10,371.
With as many as 5,117 recoveries, which eclipsed the fresh infections for the second successive day, 6,12,320 people have so far been discharged following treatment, a Health department bulletin said.
Barring two days, Tamilnadu has been posting more recoveries than fresh cases since 4 October.