Delhi's R-value, which indicates the spread of COVID-19, was recorded at 2.1 this week, implying that every infected person is infecting two others in the national capital, according to an analysis by IIT-Madras. NDTV speaks to Dr Naresh Trehan, Chairman and MD, Medanta and Dr N N Mathur from Lady Hardinge Medical College on whether this rise in the R-value and Covid spread is a reason to worry immediately or not.