Tamil Nadu Cross Sectional Sero survey in July, covering over 26,000 samples revealed that at least 66.2 percent of the population has developed antibodies to SARS-CoV-2, the virus which causes COVID-19. Among the 26,610 samples tested, 17,624 individuals had IgG (Immunoglobulin G) antibodies against SARS-CoV-2 virus.
While the overall seroprevalence was 66.2 per cent, the highest seropositivity was observed in Virudhunagar district at 84 per cent while Erode in west Tamil Nadu reported the lowest at 37, according to the latest serosuvrey conducted by the Directorate of Public Health and Preventive Medicine in 888 clusters across the state. It was released by state Minister for Medical and Family Welfare Ma Subramanian in the presence of Principal Health Secretary Dr J Radhakrishnan and Director of Public Health (DPH) and Preventive Medicine Dr T S Selvavinayagam on Saturday.
In the earlier state-wide serosurveys conducted by DPH&PM, the seropositivity was 31 per cent in October/November 2020, and 29 per cent (in the second conducted in April 2021). The overall seropositivity of 66.2 per cent detected during the third survey could be attributed to various possible reasons including the timing of serosurvey conducted during the declining phase of the Covid second wave in Tamil Nadu. 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 count rose to 34,050.
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