Third jabs are being given on the NHS for people most at risk from COVID-19, who have had a second dose of a vaccine at least six months ago. Like some other vaccines, levels of protection may begin to wane over time, and the booster aims to give you longer term protection.
Those eligible should be contacted by the NHS. They include those aged 50 and over, people who live and work in care homes, and frontline health and social care workers
Those aged 16 and over with a health condition that puts them at high risk of getting seriously ill from COVID-19, or who are a main carer for someone at high risk from COVID-19, or live with someone who is more likely to get infections, are also eligible.
People who are pregnant and in one of the eligible groups can also get a booster dose, according to the NHS.