Investors banking on a coronavirus vaccine to save the world economy in 2021 need to temper their ambitions as scientists increasingly warn of a long and difficult road ahead.
While drug companies are making progress in the quest to find a cure for a disease that triggered the worst recession since the Great Depression, questions remain about how effective the first wave of vaccines would be, how easy they will be to distribute to more than 7 billion people and then how many will agree to take them.
The future for global growth relies on the answers to those questions