The result of the fifth serosurvey has brought some relief to the civic body, as the cross-sectional study has shown Covid-19 antibodies among 86.64 per cent of the surveyed Mumbaikars. Seroprevalence was significantly higher in study subjects who received either first or both doses of vaccine as compared to their unvaccinated counterparts, said officials.

The study included participants, aged 18 years and above, from all 24 wards of the city and were selected by systematic random sampling and those visiting Municipal Dispensaries and General Practitioners' Clinics in slum and non-slum areas, respectively. Participants were recruited with informed consent. Data collection was done by the means of a mobile software application. Total samples collected and tested was 8,674.