The UK has become the first country to approve a dual vaccine which tackles both the original Covid virus and the newer Omicron variant.
The upgraded vaccine should be available as an autumn booster and give better protection against variants.
Moderna said it could supply doses in the next few weeks, but exactly who will get them has yet to be announced.
All over-50s and people in high-risk groups will be offered some form of booster from next month.
