Two years ago, on 11 March 2020, the 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 causes, has to date caused more than six million deaths, making it one of the most deadly pandemics in history.