public health england estimates that nearly 85,000 deaths have been prevented as a result of the covid—19 vaccination programme in england so far. however, the study�*s lead investigator said vaccine efficacy could drop to 50% by the winter and boosters would be needed. it is bringing into focus this need for some action. we can�*tjust sit by and see the protectiveness slowly waning while cases are still high and a chance of infection is still high as well. the government has said there will be boosterjabs sometime in september, starting with those most at risk of severe covid—19. sophie hutchinson, bbc news. the number of confirmed daily cases