18:00Six O'Clock News03/12/2020 US expert questions UK vaccine approval speedBBC Radio 4 Duration: 30 minutes Thu 3rd Dec 2020, 18:00 on BBC Radio 4 FMAvailable for over a yearListen nowAmerica's top infectious diseases expert has questioned the speed at which the UK approved the Pfizer/Biontech coronavirus vaccineGenresNewsBrandSix O'Clock News Source: BBC Online