Question to the Department of Health and Social Care:

To ask the Secretary of State for Health and Social Care, what is the current average efficacy of the covid-19 booster vaccine after (a) 4 weeks, (b) 8 weeks and (c) 4 months.

Data on the current average efficacy of the COVID-19 booster vaccine is not available in the format requested. However, recent data on the Omicron variant shows that two to four weeks after a COVID-19 vaccine booster dose, vaccine effectiveness against symptomatic infection ranged from approximately 65 to 75%, reducing to 55 to 70% at five to nine weeks and 40 to 50% from 10 or more weeks after the booster dose. Vaccine effectiveness against hospitalisation is much higher, at approximately 95% at two to nine weeks after a booster dose and remaining at approximately 90% at 10 or more weeks in those aged 65 years old and over following a booster vaccination.