Covid-19: Vaccine booster study begins in Cambridge

Clinical trials have begun in Cambridge to see which Covid-19 vaccine works best as a third 'booster' jab. Researchers at the Addenbrooke's Hospital site are recruiting about 180 participants for a national trial, which will test seven vaccines. The Cov-Boost study will give people a third dose of a vaccine to see whether it offers better protection against the virus than the standard two injections. Prof Krishna Chatterjee called the study an 'exciting opportunity'. The government-funded trial, led by the University of Southampton, is taking place at 18 sites across the UK and is said to be the first study in the world to provide vital data on the impact of a third dose on patients' immune responses.