Right from the outset of the pandemic in 2019, we always knew that there is a possibility of the COVID-19 virus, (which is a SARS-CoV-2 virus), mutating or having different variants. But what we didn’t know was how these variants will behave. From then till now I think we must have had several variants; some dominant in the sense that they become the agents of transmission, and responsible for a big burden of new transmissions, and some just fizzle out. So the Delta variant is arranged in such a way that it easily attaches to the membranes and easily multiplies. It is more infective, and can transmit from one person to the other quickly.