Correct Answer : Antibody
Sero survey is used to determine the prevalence of antibodies in the community. In the process, blood samples are tested for the presence of IgG (Immunoglobulin G) antibodies, which determine a past infection due to Covid-19.
NITI Aayog Member Dr VK Paul announced that the Indian Council of Medical Research (ICMR) will start the fourth nation-wide Covid-19 serosurvey.