Booster backing

An expert group convened by the World Health Organisation says there may be some benefit in giving a second booster dose of coronavirus vaccine to the most vulnerable people amid the continuing global spread of Omicron and its subvariants. The United Nations health agency said there was “a growing body of evidence regarding the value of an additional booster dose” for groups including health workers, people aged over 60 and those with weak immune systems. The WHO said its expert group had assessed the limited data from seven studies for second booster doses of messenger RNA vaccines, saying there wasn’t enough information proving their effectiveness in younger, healthy people.