CHENNAI: At the baseline of the second wave of covid, 66.2% people in Tamil Nadu have Antibodies According to a survey, against the virus state health department. The increased number is because more people were either infected with the virus or vaccinated.
Phase 3 of a state-wide cross sectional serosurvey A survey of 26,610 people from 888 clusters of districts was conducted by the Directorate of Public Health and Preventive Medicine in July. Health workers took blood samples from each of these groups, with 30 people drawn randomly from a village (in rural areas) or a street (urban area). These samples were tested for the presence of antibodies against SARS Cov-2, the virus that causes Covid-19. These tests were conducted in six referral laboratories of the Directorate at Chennai, Trichy, Madurai. Coimbatore, Tirunelveli and Salem.
The analysis showed that out of the samples tested, 17,624 people IgG Antibodies against the virus – either because they were infected or were vaccinated against the virus. Although the overall prevalence was 66.2%, it was not uniform across all the districts. The highest seropositivity was observed in Virudhunagar (84%), which is more than double the reported 37%. End District. While Chennai had 82% seropositivity, Coimbatore and Erode had 43% and 46% respectively.
“The second wave was fierce. The state reported over 36,000 people in a day taking a toll on the healthcare system. In addition to those who showed symptoms and later tested positive, said director of public health, Dr TS Selvavinayagam. There could have been many others who were asymptomatic.
“Besides, the vaccination campaign has also been intense. By the start of this survey on June 10, 97.6 lakh people had received at least one dose of the vaccine,” he said.
Phase 3 of a state-wide cross sectional serosurvey A survey of 26,610 people from 888 clusters of districts was conducted by the Directorate of Public Health and Preventive Medicine in July. Health workers took blood samples from each of these groups, with 30 people drawn randomly from a village (in rural areas) or a street (urban area). These samples were tested for the presence of antibodies against SARS Cov-2, the virus that causes Covid-19. These tests were conducted in six referral laboratories of the Directorate at Chennai, Trichy, Madurai. Coimbatore, Tirunelveli and Salem.
The analysis showed that out of the samples tested, 17,624 people IgG Antibodies against the virus – either because they were infected or were vaccinated against the virus. Although the overall prevalence was 66.2%, it was not uniform across all the districts. The highest seropositivity was observed in Virudhunagar (84%), which is more than double the reported 37%. End District. While Chennai had 82% seropositivity, Coimbatore and Erode had 43% and 46% respectively.
“The second wave was fierce. The state reported over 36,000 people in a day taking a toll on the healthcare system. In addition to those who showed symptoms and later tested positive, said director of public health, Dr TS Selvavinayagam. There could have been many others who were asymptomatic.
“Besides, the vaccination campaign has also been intense. By the start of this survey on June 10, 97.6 lakh people had received at least one dose of the vaccine,” he said.
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