India, March 24 -- Four years ago this day an announcement by Prime Minister Narendra Modi - of nationwide lockdown - shook entire India, which was starting to feel the pressure of a fast-spreading infection through a virus that the world had no idea how to treat: the novel coronavirus, also named Covid-19, short for coronavirus disease 2019.

The memory of that nationwide shock - empty roads, crores of migrant workers heading back home, and offices abruptly shifting to work-from-home mode - still feels fresh for many. This is reflected in people continuing to search for "lockdown in India" even today.

After months of reporting thousands of cases daily, many deaths and a mega vaccination drive, India managed to fight Covid-19 and does no...