Covid ‘booster’ trial will give third vaccine dose to UK volunteers
Scientists to test seven vaccines for possible protection against new variants in effort to avert winter surge in infections
Thousands of volunteers will be injected with a third dose of Covid-19 vaccine as part of a trial to investigate which ones could be used as booster" doses to protect against new variants and prevent hospitals from being overwhelmed by a potential fresh wave of infections this winter.
The Cov-Boost trial - the first in the world to provide vital data on the impact of a third dose on patients' immune responses - will study the effect of giving an additional dose of one of seven different vaccines to 2,886 UK participants, on top of the two doses of the Pfizer/BioNTech or Oxford/AstraZeneca vaccines they have already received.
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