The UK has become the first country in the world to roll out the Covid-19 vaccine developed by Pfizer and BioNtech, initially making the shot available at 50 hospitals.
The NHS is giving priority to vaccinating people over the age of 80, frontline health careworkers and nursing home staff and residents.
Here is what people getting the vaccine should expect. What happens when someone gets the vaccine? The vaccine, developed with new messenger RNA technology using a manufactured fragment of the coronavirus' genetic code, is injected into the arm.
The immunisation is given in two doses, three weeks apart, and has been shown in trials to protect up to 95% of recipients from contracting Covid-19.