3rd phase of serosurvey begins in Tamil Nadu
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The third phase of serosurveillance, which started on Monday, will cowl 888 clusters in the State. Around 25,000 samples will likely be lifted for detection of SARS-CoV-2 IgG antibodies.
The first serosurvey, carried out by the Directorate of Public Health and Preventive Medicine in October-November 2020, discovered an general seropositivity of 31%. This was adopted by a second one this April (besides in Chennai) which recorded an general seroprevalence of 23%. During the second survey, the very best seropositivity was reported in Tiruvallur (49%) and lowest in Nagapattinam (9%).
In serosurveys, a mix of components are at play, T.S. Selvavinayagam, Director of Public Health, mentioned. “This includes the level of infection, vaccination and the individual’s immunity. At that point of time, it can indicate the level of susceptibility to infection in the community. It can increase or decrease,” he mentioned.
When seroprevalence crosses 70% — by way of an infection and vaccination — it’s established that there will likely be safety, he mentioned, including: “The challenge of newer variants remains. So serosurveys can only tell you what level of immunity there is within a population, through a combination of infection and vaccination.” The third phase will cowl 888 clusters, unfold throughout 46 health-unit districts.
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