India’s high seroprevalence of over 67 per cent suggests that a significant part of the population has Covid antibodies but the government is being cautious about making any herd immunity claims. (Seroprevalence is the percentage of individuals in a population who have antibodies to a pathogen; and herd immunity is when a large portion of a population becomes immune to a disease, making its spread from person to person unlikely.) While some experts believe that a large part of India is still vulnerable to the virus that could trigger a third wave, others feel the country is not likely to