Who can have a booster jab and how can you get one?
TThe UK government is buying 114 million more doses of Pfizer and Moderna vaccines, following the announcement that a booster will be offered to all adults.
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Twelve to 15-year-olds will also be offered a second dose.
When can I have the booster?
You will be offered a booster dose three months after your second dose (or third, if you have a weakened immune system).
Vulnerable people will be contacted first, followed by older age groups, then younger ones.
The UK and Scottish governments have said all eligible adults will be offered a booster by the end of January - although some may be given at a later date.
Rather than contact the NHS for an appointment, "people should wait to be called", Health Secretary Sajid Javid said.
In England, jabs will be rolled out at 1,500 community pharmacy sites and extra hospital hubs.
Why do I need a booster?
A booster is an extra dose of vaccine which prolongs protection, and can cut the risk of infection by more than 93%.
The booster will usually be the Pfizer or Moderna vaccine, regardless of what you received for earlier jabs.
AstraZeneca is also approved, but is thought to be less effective.