The Telegraph leads with new research suggesting immunity to Covid-19 may only last a matter of months – potentially hindering the roll-out of a successful vaccine. The study by Imperial College London, which involved 365,000 people, found antibodies in the population fell by more than a quarter in three months. Scientists said the findings suggested a “rapid” decline in immunity, which could mean that even if a successful vaccine was found, it might have to be administered as often as twice a year, the paper reports.