India, April 15 -- One month ago, the early signs of a fourth Covid-19 wave began to appear in Delhi. The case trajectory had bottomed out on February 12 with 125 new cases, leading to complacency from the administration, laxity from the public, and premature vaccine jubilance from both. But it, then, slowly started to rise, with the average positivity rate jumping from 0.4% to 2.7% between March 1 and March 31. By then, Maharashtra was already in the grip of a raging outbreak, and reports of infections were growing across the country. The national daily case count went from 15,478 to 61,954 over the four weeks. It was clear that the question was not if, but when, the outbreak would reach Delhi. Delhi needed to act fast, and get ahead of ...