Latest sero survey reveals that nearly 33% of Delhi population has developed Covid-19 antibodies. This was revealed in the initial analysis of the third serological survey in which 17,000 samples were collected from all 11 districts. The outcome of this survey is expected to be officially announced next week. In general terms, it means that 66 lakh of the two crore Delhiites were infected with the novel coronavirus and now carry antibodies after their successful recovery. This would also be the highest seroprevalence since the outbreak of the pandemic. The second survey conducted in the first week of August showed the prevalence of Covid-19 antibodies in 29.1% of the population, up from 23.4% in the first serological study that was conducted from June end to early July. While 15,000 samples were collected for the second survey, over 21,000 samples were gathered in the first one. Describing it as a good sign, an official said, “People who have antibodies are not currently infected. They have recovered from Covid-19. Many of them didn’t even realise that they had been infected and recovered successfully.”