New Delhi: More than 23% of Delhi’s 1.9 crore population showed evidence of past exposure to Sars-Cov-2, which causes the coronavirus disease, in almost six months and that a large number of infected people remain asymptomatic, the result of the sero-prevalence study conducted in the national capital shows.
The Union health ministry said in a statement that 21,387 samples were collected in accordance with laboratory standards and were tested between June 27 and July 10 to determine the extent of the spread of the coronavirus disease in Delhi.
“Nearly six months into the epidemic, only 23.48% of the people are affected in Delhi, which has several pockets of dense population,” the Union health ministry, which commissioned the study, said in a statement.
The seroprevalence study was conducted jointly by the National Center for Disease Control (NCDC) and the Delhi government “following a rigorous multi-stage sampling study design.”
Blood samples were taken from randomly selected people as part of the survey, which involves rapid tests for antibodies, to study the scale of undetected infections. The samples were tested to ascertain the population-level presence of the IgG antibody, which indicates past infection.
“This can be attributed to the proactive efforts taken by the Government to prevent the spread of infection including prompt lockdown, effective containment and surveillance measures, including contact tracing and tracking, as well as citizen’s compliance to COVID Appropriate Behaviours,” the health ministry said in the statement.