Why Did Covid Cause Thousands of Deaths in Spring 2020 Even Though it Had Been Hanging Around All Winter?
There is now no shortage of evidence that the coronavirus had begun spreading undetected all over the world by autumn 2019 at the latest. So why did the virus suddenly become much more infectious in February 2020; why did it go from circulating at a low level alongside flu and other viruses to displacing them and infecting a relatively large proportion of the population in a space of weeks?