Covid vaccine safety: How does a vaccine get approved?

The NHS is carrying out the biggest mass vaccination campaign in its history with a jab that protects against Covid-19.

Three Covid vaccines have been approved in the UK: Moderna, Oxford AstraZeneca and Pfizer-BioNTech.

Some people have been surprised to learn how a process which usually takes at least ten years could have been done in less than one.

What safety checks have been made to get the Covid vaccine to this point?

BBC health reporter Laura Foster explains.

Video by Laura Foster, Terry Saunders, Mel Lou and Kate Forbes.