by Paul RICARD Agence France Presse It is, scientists say, the most worrying Covid-19 variant since delta and perhaps ever. Here is what we know — and what we don’t — about the strain thought to have originated in Southern Africa. – How worrying? “This one is worrying and I’ve not said that since delta,” British virologist Ravi Gupta said on Twitter, about the variant labelled B.1.1.529. Concerns among disease experts stem from the variant’s […]