Britain's booster programme for Covid-19 vaccinations is to be expanded to younger people. The UK government's Joint Committee on Vaccination and Immunisation (JCVI) said all healthy adults aged 40-49 should be offered a booster, six months after their second dose.
Previously, the booster programme was limited to those aged 50 and over, and the clinically vulnerable. Some 12.6 million Britons have received a third jab.
The JCVI also said that 16 and 17-year-olds should now be offered a second dose of the Pfizer/BioNTech jab. That age group had previously been offered only one dose in Britain, pending more data on the jab's safety in under-18s.