by Amélie BOTTOLLIER-DEPOIS Agence France Presse PARIS, France (AFP) — The emergence in Britain and South Africa of two new variants of Sars-CoV-2, which are potentially far more infectious versions of the virus, has prompted widespread concern. Here is what we know — and what we don’t — about the mutations. – What are they? All viruses mutate when they replicate in order to adapt to their environment. Scientists have tracked multiple mutations of […]