It may also prove difficult to maintain the type of social isolation as ordered by Modi. In India, there are 455 people per square kilometer (or 1,178 people per square mile), according to World Bank statistics -- significantly more than the world average of 60 people, and much higher than China's 148. "Social distancing in a country like India is going to be very, very challenging," Prabhakar said. "We might be able to pull it off in urban areas, but in slums and areas of urban sprawl, I just don't see how it can be done."