Scientists working on human trials of a potential Covid-19 vaccine in Oxford believe they have made a breakthrough after discovering the jab could provide "double protection" against the virus.
The phase 1 trial in healthy adult volunteers, which began in April, showed the vaccine generated an immune response, with blood samples indicating it stimulated the body to produce both antibodies and "killer T-cells", the Daily Telegraph reported.
It came as Health Secretary Matt Hancock said teams were working towards a "best case scenario" of a vaccine being made available some time this year, although he conceded it was more likely in 2021.