Coronavirus: Your questions answered
As the coronavirus mutates into new strains and vaccines are rolled out around the world new questions are being asked about how we live with the pandemic.
Philippa Thomas put the latest questions from BBC World News viewers to Dr Gigi Gronvall, an immunologist at the Johns Hopkins Centre for Health Security in the US and Nathan Peiffer Smadja, a physician specialising in Internal Medicine and Infectious Diseases in France.