Professor Sarah Gilbert, the world-renowned expert leading Oxford University’s team devising a vaccine, told MPs that it would provide ‘a good duration of immunity for several years at least, and probably be better than naturally-acquired immunity.’ Asked for a timeline on the vaccine amid concerns of facing the winter without one, she said, ‘I hope we can improve on those timelines and come to the rescue.’ 8,000 Britons are in a major trial of the Oxford vaccine, and an experimental vaccine is being tested by a German partner. These trials showed encouraging early results, producing neutralising antibodies between 1.8 and 2.8 times greater than those of recovered patients. The key question is whether the vaccine will protect people from becoming infected, or simply make them less ill. It may also work less well in older people because their immune systems are weaker.