There are grounds for optimism but also several unknowns around this coronavirus vaccine
Hopes that the end of the coronavirus pandemic has become nearer have soared after the news that a coronavirus vaccine was found to be 90% effective in global trials.
Although there is definite reason to be optimistic, experts have cautioned that the data from the trials conducted by Pfizer and BioNTech are not final, and there remain plenty of unknowns.
Related: Covid vaccine could be ready for rollout next month, says Hancock
