21.5% People Exposed to Coronavirus, Says Chennai's Serological Survey
Atleast 21.5% of the people tested in Chennai has developed immunity against coronavirus, a serological survey conducted by the Greater Chennai Corporation (GCC) suggested. GCC Commissioner informed that, for the survey, over 12,000 samples were collected randomly in July. He also added that the COVID-19 positivity rate has decreased from 30% to 9% in the city. A serological survey provides insight on the extent of the virus' spread.