Last updated 2 June 2022
People with a severely weakened immune system around the time of their first or second dose may be eligible for a third primary COVID-19 vaccine dose. A third primary vaccine serves a different purpose than a booster vaccine.
If you had a severely weakened immune system due to an underlying health condition or medical treatment around the time of your first or second dose you may not have made a good immune response to COVID-19. We may be able to offer you a third primary dose of the vaccine if you are aged 12 years and over and had severe immunosuppression around the time of your first or second dose of COVID-19 vaccination. The third dose will improve your levels of immunity to give you better protection.
The Joint Committee on Vaccination and Immunisation has also recommended that you should have a booster vaccination at least three months after your primary course.
Also, people with a severely weakened immune system now may be eligible for a spring booster. The Joint Committee on Vaccination and Immunisation recommended on 21 February that you should have a spring booster around 3-6 months after your first booster if you currently have a severely weakened immune system. More information is available from our spring booster page.