Third dose trial, Cov-Boost study https://www.bbc.co.uk/news/health-571… Need for third dose autumn or winter? Factors Variants and vaccine efficacy Longevity of protection Trial starts in June N = 3,000 All ages who had their first dose in December or January Prof Saul Faust, chief investigator, University of Southampton It could be that some age groups may not need a booster and others do The aim is to find out whether there should be a booster campaign and which vaccine to use Vaccines t

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