The Second Chennai sero survey results from the city reveal that 32.3 percent of the city’s population has developed IgG anti-bodies to Covid-19. The data reveals that one in three people in the city was exposed to the novel coronavirus which led to the development of antibodies.

“Results of Chennai Serosurvey-II: Serosurvey samples tested- 6,389 out of which 2,062 are positive for IgG antibodies presence with overall positivity of 32.3 percent,” Greater Chennai Corporation said in a brief statement.

The results come at a time when daily cases in the city have slowed down to the 1000-mark.

The figures show a jump from a previous sero survey that was conducted earlier in July, which said that one-fifth of the population was exposed to the novel virus. The first phase of the survey, with a sample size of around 12,000, had revealed (on September 1) that a fifth of the population (21.5 percent) in the metropolis had exposure to the pathogen.

The population-based sero surveys are performed to measure the spread of infection within the community and such surveys are done by performing individual blood tests to check if they have developed antibodies to the infection.

The study which was conducted by the National Institute of Epeidemiology of the Indian Council of Medical Research and the Greater Chennai Corporation was based on the analysis of blood samples from 12,405 individuals from all zones of the city.

Tamil Nadu’s overall tally of COVID-19 cases moved closer to the seven lakh-mark as 3,086 more persons tested positive on Wednesday. The number of persons discharged so far has crossed 6.50 lakh. Meanwhile, in Chennai, 845 persons tested positive, taking the total count to 1,92,527 — 1,77,546 discharged, 11,425 active cases and 3,556 deaths. Among the 39 deaths (21 at government hospitals and 18 at private hospitals), Chennai accounted for 11.

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