Survey teams were set up for all 11 districts of Delhi and blood samples were collected from select individuals after taking written informed consent. The sera so collected were then tested for IgG antibodies and infection using Covid KAVACH ELISA, approved by Indian Council for Medical Research (ICMR).
This was one of the largest sero-prevalence studies conducted in the country using the ELISA testing.
Notably, the study indicated that a large number of infected persons remained asymptomatic. This implies the following:
1. Nearly six months into the epidemic, only 23.48 per cent of the people are affected in Delhi, which has several pockets of dense population. This can be attributed to the proactive efforts taken by the government to prevent the spread of infection, including a prompt lockdown, effective containment and surveillance measures like contact tracing and tracking, as well as citizen's compliance to appropriate Covid-19
2. However, a significant proportion of the population is still vulnerable. Therefore, containment measures need to continue with the same rigour. Non-pharmacological interventions like physical distancing, use of face mask/cover, hand hygiene, cough etiquette and avoidance of crowded places, must be followed strictly.
According to the health ministry data, Delhi's Covid-19 caseload on Tuesday increased to 123,747, and the death toll rose to 3,663.