A third Covid vaccine has been approved for use in the UK.
It is made by the company Moderna and works in a similar way to the Pfizer one that is already being offered on the NHS.
Supplies of the new jab are not expected to be available until the spring however. The UK has now pre-ordered 17 million doses.
Around 1.5 million people in the UK have had at least one dose of Covid vaccine so far.
That includes almost a quarter of those aged over 80 in England.
Vaccines are being given to the most vulnerable first, as set out in a list of nine high-priority groups, covering around 30 million people in the UK.
How does the Moderna jab compare with the others?
The Moderna vaccine requires temperatures of around -20C for shipping – similar to a normal freezer.
In comparison, the Pfizer/BioNTech one requires temperatures closer to -75C, making transport logistics much more difficult.
The AstraZeneca jab is easier to store and distribute, as it can be kept at normal fridge temperature.
All of these vaccines requires a second booster shot.
In trials with more than 30,000, the Moderna vaccine offered nearly 95% protection from severe Covid.
No vaccine is 100% effective and it takes time for protection to build. For all of the Covid vaccines, we still do not know how long immunity will last.
People who have received a coronavirus vaccine should continue to follow social distancing rules to protect themselves and others.
EU regulators have already approved the Moderna vaccine.