今年2月新德里估计56%有抗体
https://fortune.com/2021/02/03/delhi-covid-antibodies-india-declining-cases-herd-immunity/
去年8月Pune估计52%有抗体
https://fortune.com/2020/08/21/covid-antibodies-india-pune-survey-herd-immunity/
今年2月全印度估计25%有抗体
https://www.dnaindia.com/health/report-25-percent-of-indians-have-developed-antibodies-against-covid19-reveals-icmr-serosurvey-indian-council-of-medical-research-2872490