In the serological survey carried out in Delhi, 28% of the population in Central district was found affected by the novel coronavirus, which was the highest across the city. An age-wise analysis of the positive cases revealed that those in the 31-40 year bracket (21.4%) were affected the most, followed by those in the 21-30 age group (20.7%).

from Times of India https://timesofindia.indiatimes.com/city/delhi/how-epicentre-of-covid-crisis-in-delhi-managed-a-turnaround/articleshow/77295217.cms