It is time to use the efforts of Ahmedabad city as a case study to revisit the discussion on the threshold for herd immunity. We should be careful and not jump the gun in declaring that we are nearing the threshold of population immunity at the national level. Compared to the Indian urban sample of the ICMR, the Ahmedabad city seropositivity is higher at 81%. Over 40 cities have a million population, and another 300 cities have a population between one lakh to 10 lakh. There is an urgent need to take up sero-surveillance studies to help guide the COVID-19 control strategy throughout rural and urban India.

Source: The Hindu July 23, 2021 18:22 UTC