Question to the Department of Health and Social Care:

To ask His Majesty's Government whether they will publish the data sets and methods that the Joint Committee on Vaccination and Immunisation (JCVI) used to calculate the vaccine effectiveness estimates that informed the cost-effectiveness estimates on which the JCVI’s advice for a COVID-19 vaccination programme in autumn/winter 2025 was based.

The Joint Committee on Vaccination and Immunisation’s (JCVI) advice on COVID-19 vaccination in 2025 and spring 2026 was published on 13 November 2024.

The advice was based on a cost-effectiveness study of COVID-19 vaccination by the University of Warwick, published in the journal Vaccine in February 2025 by Keeling et al. The UK Health Security Agency’s (UKHSA) vaccine effectiveness estimates were used by the University of Warwick in their cost-effectiveness analysis.

The data set and methodology used by UKHSA to calculate these estimates were published in the Journal of Infection in July 2024 by Kirsebom et al.

The JCVI continues to keep all United Kingdom vaccination programmes under review as new evidence emerges.