As a newly identified coronavirus, called Covid-19, continues to spread across the world, and case rates rise higher in India every day, the issue on a lot of minds is how we can flatten the rapid transmission and how the outbreak would subside. In this context, one often hears about ‘herd immunity’, which Sweden had put its weight behind in the early days of the virus spread. Initially, some other countries like the UK had also preferred developing herd immunity to locking down but later changed tack as the number of cases zoomed.
Coronavirus, emerged in China in December 2019, can affect our lower respiratory tract (lungs and windpipe) or upper respiratory tract (throat, sinuses and nose).