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Tamil Nadu: 66 Per Cent Population Has Developed Covid-19 Antibodies, Reveals Serosurvey

In the previous serosurvey, the seropositivity rate was at 31 per cent (October-November 2020) and 29 per cent (April 2021).

A BMC health worker collects swab samples of a passenger for Covid-19 test at CSMT station in Mumbai, on July 24, 2021; (PTI Photo)

New Delhi: Over 66.2 percent of the people have developed Covid-19 antibodies in Tamil Nadu, revealed the data collected in the third serosurvey in Tamil Nadu by the Directorate of Public Health and Preventive Medicine.  26,610  samples have been tested in the survey out of which 17,624 had IgG (Immunoglobulin G) antibodies against Covid-19.

The survey conducted in 888 clusters found that the average overall seroprevalence at 66.2 percent.

Virudhunagar district had the highest seropositivity rate with 84 per cent of people developing antibodies against the virus.

Meanwhile, Erode had the lowest seropositivity rate in the survey with only 37 per cent of people developing antibodies against the virus.

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Ma Subramanian, state Minister of Health released the findings of the survey in the presence of Principal Health Secretary Dr J Radhakrishnan and Director of Public Health (DPH), and Preventive Medicine Dr T S Selvavinayagam, here on Saturday.

In the previous serosurvey, the seropositivity rate was at 31 per cent (October-November 2020) and 29 per cent (April 2021).

“Intense vaccination drives across the state from January 16, 2021 and inclusion of 18+ age individuals for vaccination would have generated protective antibodies in the population. As on June 10, 2021, 97.6 lakh people got vaccinated (either single or double dose) in Tamil Nadu,” the survey report said.

The survey revealed that Western districts such as Erode, Coimbatore, and Tiruppur reported lower levels of seropositivity which explains the high number of new Covid-19 cases being reported in these areas.

In each cluster, 30 participants were randomly drawn from a village if the area was rural or from a street in case of an urban area.

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Blood samples were collected from a total of 26,610 participants and tested for the presence of SARS CoV-2 IgG antibodies using Chemiluminescence based Immuno Assay (CLIA).

All the samples were tested at six referral labs of DPH & PM located in Chennai, Tiruchirappalli, Madurai, Coimbatore, Tirunelveli and Salem for the detection of IgG antibodies.

On Friday, Tamil Nadu reported 1,947 new covid-19 cases taking the overall tally to 25,57,611. With 27 deaths due to the infection, the toll rose to 34,050.

Over 2.15 crore persons have taken the jabs through government-run and private hospitals in the state, so far.

With inputs from PTI

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