The vaccine - called R21 - appears to be hugely effective, in stark contrast to previous ventures in the same field. Prof Adrian Hill, director of the Jenner Institute at the University of Oxford, where the vaccine was invented, says African countries are declaring: "we'll decide", after being left behind in the rollout of Covid-19 vaccines during the pandemic. Adar Poonawalla, CEO of the Serum Institute, said: "Developing a vaccine to greatly impact this huge disease burden has been extraordinarily difficult