play-icon
Video report by ITV News Health Editor Emily Morgan
The UK has been embroiled in a growing row over the decision to delay giving the second dose of the Covid-19 vaccines.
Patients in the UK could have to wait up to 12 weeks after their first Pfizer jab instead of the recommended 21 days in order, the British government says, to speed up the vaccine rollout.
The delay will also apply to the Oxford/AstraZeneca vaccine, although, with some evidence from trials that a second dose up to 12 weeks later does not interfere with the efficacy of the jab, this has caused less global controversy.