Delhi's sero-prevalence study finds 23.48 per cent people affected by Covid-19

The study, which was conducted from June 27 to July 10 by the National Center for Disease Control (NCDC) in collaboration with the Delhi government, also indicated that a large number of infected persons remain asymptomatic, it said. A sero-survey involves testing of blood serum of individuals to check for the prevalence of antibodies against an infection.

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