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How do serological surveys work?

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Serological surveys are now being increasingly done in many parts of the world, with one such survey’s results from Delhi released yesterday. ThePrint’s Sandhya Ramesh takes a look at the how these tests are done and how to interpret their results.

Correction: In ELISA tests, antigens are not introduced in the body. They are tested with blood samples. Error is regretted.

Relevant links:
Serological survey report by National Centre for Disease Control says 23.48% of 21,387 samples collected across 11 districts of Delhi had antibodies against the Covid infection: https://theprint.in/health/one-in-four-people-in-delhi-infected-by-covid-till-first-week-of-july-sero-survey-finds/465246/

Indian Journal of Ophthalmology article on understanding sensitivity and specificity: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2636062/

Priyanka Pulla’s story on ELISA kit accuracy: https://science.thewire.in/health/icmr-accuracy-inflated-sensitivity-specificity-covid-kavach-elisa/
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