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Seropositivity in Tamil Nadu stands at 70 pc, reveals third survey
The third sero survey by the Directorate of Public Health and Preventive Medicine in July-August 2021 revealed a 70 per cent seropositivity in the State. A total of 827 clusters were included, covering 24,586 samples, of which 17,090 individuals had IgG antibodies against SARS-CoV-2.
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Each cluster consisted of 30 participants drawn randomly from a village of a rural area or a street in urban area. Blood samples were collected and tested for the presence of SARS COV-2 IgG antibodies using Chemiluminescence based Immuno Assay (CLIA). Highest seropositivity of 84 per cent was observed in Virudhunagar, followed by Tenkasi, Chennai, Madurai and Theni. The lowest seropositivity of 51 per cent was reported in Karur. Four districts—Perambalur, Ariyalur, the Nilgiris and Karur—reported seropositivity of less than 60 per cent.
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