Healthcare Coronavirus most prevalent among those in 5-17 age bracket: Delhi Sero survey Updated : August 25, 2020 11:20 AM IST As many as 15,000 people from four age groups participated in the survey -- around 25 percent of them below 18, 50 percent between 18 and 50, and the rest aged above 50. Experts say children could be contracting the infection from adults in their family and domestic helps. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.