New Delhi, July 10 -- The Delhi government on Thursday directed its dispensaries and polyclinics to begin testing for Covid-19 using the antigen-based method. The test will be available at the centres between 9am and 12 noon on working days, according to the order issued by Delhi's director general of health services Dr Nutan Mundeja.

An antigen is a foreign molecule that induces an immune response in the body, especially the production of antibodies, and detecting its presence determines a present infection.

"With nearly 2,500 cases being reported each day, there are expected to be at least seven to eight direct and high-risk contacts (at home and workplace). Aggressive contact tracing and testing holds the key to ensure that the infecti...