Live and Local Podcast - Supporting Live Local Music On The Isle Of Wight COVID-19: Scientists say vaccines could control pandemic, as Bill Gates optimistic 'the end will come' So far, more than 33 million people have had at least one dose of a vaccine in the UK, while 11 million have had two jabs. Some initial research from the UK has found that a single shot of either the Pfizer-BioNTech or coronavirus cases and a 74% drop in cases which are symptomatic. Following both doses of Pfizer, there was a 70% fall in all COVID cases, and a 90% drop in those which were symptomatic. People who are symptomatic are most likely to spread the virus.