To ask the Secretary of State for Health and Social Care, what the difference in risk of serious illness from covid-19 is of having a booster vaccination for someone who has previously had two doses of the vaccine.

Early data suggests that vaccine effectiveness against hospitalisation and severe illness after two doses is 72%, compared to 88% following a booster dose. Analysis will continue as the booster programme progresses, including monitoring the duration of protection of booster doses against a range of disease outcomes.