Five things about covid we still don’t understand at our peril

Washington Post –

In less than three years, researchers have published more than 200,000 studies about the virus and covid-19. That is four times the number of scientific papers written on influenza in the past century and more than 10 times the number written on measles. Still, the virus has kept many of its secrets, from how it mutates so rapidly to why it kills some while leaving others largely unscathed — mysteries that if solved might arm the world’s scientists with new strategies to curb its spread and guard against the next pandemic.