https://www.youtube.com/watch?v=vAYYa5WFZIQ Mr. Bachchan states "darwaza bund bimari bund" which is mostly accurate.The virus however has a way of sneaking into living spaces through sewer and drain pipes.
People in the Big Cities living in large apartment complexes are exposed to this very infectious variant at home behind closed doors where they may think that they are safe. The virus travels through sewage drain pipes and can be allowed in the bathroom air when the toilets are flushed. Recommendations to combat this infection mode include closing the toilet lid before flushing, wearing face masks whenever entering bathrooms, even at home. The Covid 19 Variant B.1.617.2 now raging in India, has been deemed a variant of concern in many countries as it is extremely infectious.