Exactly two years ago, on March 11 2020, the World Health Organization (WHO) declared Covid-19 a global pandemic.This was two months after there were reports of a mystery virus infecting people in Wuhan, the most populous city in central China. Early reports said the virus didn’t appear to be readily spread by humans.Well, the Sars-CoV-2 virus could indeed be spread by humans. It quickly travelled around the world, and has so far infected more than 450 million people.Covid-19, the disease it…
