NEW DELHI : Smokers and vegetarians were found to have lower seropositivity indicating that they may be at a lesser risk of getting infected by coronavirus, according to a pan-India serosurvey conducted by the Council of Scientific and Industrial Research in its nearly 40 institutes.The survey also found that those with blood group 'O' may be less susceptible to the infection, while people with 'B' and 'AB' blood groups were at a higher risk.For its study, the Council of Scientific and Industrial Research (CSIR) took samples of 10,427 adult individuals working in its laboratories or institutions and their family members, based on voluntary participation, to assess the presence of antibodies to SARS-CoV-2.The study which was piloted by.